QFZ3713 Assignment 1 - All posters

NURUL IZZATI AMIRA BT MOHD IMRAN (S59615)

Relative Humidity

The ratio of the amount of water vapor actually present in the air to
greatest amount of possible at the same temperature.

Factors that effect Relative Humidity

Amount of water: If you increase the amount of water in the air(by adding it due to evaporation),
Relative humidity will go up.
Temperature: Since warm air can hold more water than cold air, if you lower the temperature the
Relative Humidity will go up, even if you don't add more water.

Recommended indoor temperature atpC(o(encEcoHhwIotHaxfotRaiIerelRnrhmiuincentiottVnnfcmfIreoaeVhvechaevnfptl)mueeieelrt)baeempe.cnnelwrhmsradcrlolnnoeesguiaphese,tadotstgrvemrsutkiyeiratsvoebfohletilmeaiaohmraytettui5nara.nelung,ltuior:moe.dhS0sefstiysryenfaoreuTwroeeeui,iro,tdeorttgrlmulctayeaoehhtucocbeilsyuinfaetereoeteoegmtudi5riaidernaoctoindnefhve5slnnhatorthdnttn-tiuoodec%rtnsir.oaoteirmpooeotnne.rarteipdotlovogrlrvioucadnisoeeeiern’rrhocnosmostninrenhreatdoutvcaayeuhayluhalraeeuaboemniiceivnigricrsntotlitlysrheteivyiitosohbnirwvd,eectngursvngedoeuoidr.hdtrwiohfentsieoteyoulhnihstetneoannhyemrudoetltcfitesouahamirnmiuioalttlmtsewattgtneeaiirsshnrodetimid,aiaaadeotornidahtt?itirirerriyirfeso.irehInofrsirgh
and humidity levels for home

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the

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Reference


1.Merriam-Webster Dictionary. (2021). Retrieved November 7, 2021, from Merriam-webster.com website: https://www.merriam-

webster.com/dictionary/relative%20humidity#:~:text=Medical%20Definition%20of%20relative%20humidity%20%3A%20the%20ratio

2.amma. (2014, October 9). Humidity. Retrieved November 7, 2021, from SlideServe website:

https://www.slideserve.com/amma/humidity

3.http://www.libeo.com, L. -. (2021). Temperature and humidity variations. Retrieved from {$cte.titre.en} website:

https://www.caaquebec.com/en/at-home/guides/your-healthy-home-guide/temperature-and-humidity-variations/

QFZ3713 MEASUREMENT & INSTRUMENTATION

TEMPERATURE
& HUMIDITY

Definition of Relative Humidity (RH) Factors affect RH

RH is the ratio of current humidity to the highest Temperature: The higher the
possible humidity. Its mean the amount of water temperature, the lower the
vapor present in the air and expressed as relative humidity .
percentage (%) of amount needed to achieve Pressure: While pressure
saturation at the same temperature. Basically, it is increase, relative humidity also
how saturated a gas is with water vapor at the increase.
temperature.

Recommended HUMIDITY :
indoor 45% - 55%
TEMPERATURE :
temperature and 18°C - 24°C
humidity levels

for homes

(Central Air Conditioning, 2021)

How to control Low and High humidity level at home

When the indoor humidity (A Fresher Home, 2019) (Achoo! Blog, n.d.) When the indoor humidity
level is low during dry level is high during rainy
season, use a Humidifier season, use a Dehumidifier
to release water vapor to to remove the surrounding
the surrounding using the water vapor and let it
water that added into the condense inside the
machine and increase machine. It could make the
relative humidity level, air more dry and achieve
make the air more normal relative humidity
moisture. level.

REFERENCES Chandler, N. (2001, June 5). What Is Relative Humidity and How Does it Affect How I Feel Outside?
HowStuffWorks. https://science.howstuffworks.com/nature/climate-weather/atmospheric/question651.htm
Factors that affect the control of the humidity and its level. (n.d.). IKEUCHI.
https://www.ikeuchi.eu/news/factors-that-affect-the-control-of-the-humidity-and-its-level/

How Does a Dehumidifier Work? (n.d.). Achoo! Blog. https://www.achooallergy.com/blog/learning/how-does- TAN SHI HUI
a-dehumidifier-work/ S59632
Unsdorfer, S. (2016, October 27). Managing Ideal Indoor Humidity for Maximum Comfort. Centralhtg.com;
Central Heating & Air Conditioning. https://www.centralhtg.com/blog/managing-home-humidity-for-
maximum-comfort
‌Wondering How Close Should A Humidifier Be To Your Bed? Your Questions Answered. (2019, January 17). A
Fresher Home. https://afresherhome.com/how-close-humidifier-to-bed-placement-guide/

By: AMIESYA UMAIRAFITRI BT RAFIS SUZUEINDIE
(S59675)

relative

humidity

WHAT IS RELATIVE
DEcWtoSecwnAmPdoagOTpeatIUneNensrRrsTcaAwa:vtetTateueipIoprrOmeenotNpraco?:eoancmr!odtca!a!luaetpxurdrigrmei.feisvuaeosmnfure.

HUMIDITY (RH)?? factors?

Amount of water vapor in the 1. Temperature: when the
air. The amount of vapor temperature increase, RH will

contain in the air increases decrease which cause air more
with temperature, so the higher drier. Which means temperature
the % of RH, the more humid the
air it feels. For example, 0% RH is inversely propotional to RH.
2. water vapor pressure: RH is
means a dry condition while
100% RH means a very humid ratio of actual saturation vapor
pressure and also depend on
temperature. So, warmer the

temperature in air as the amount
of water vapor in the air also
increases.

condition. home's temperature &

mainctaoamipnfaieonrnrgttvoiainrfbdolhoeneomharelotanmhitreyaqldauanaidllyity is humidity levels?

how to control humidity levels at Recommended indoor humidity are
between 30% to 60%. But the
home?
ideal indoor humidity levels should be
-use hygrometer to accurately read our homes humidity levels. around 45% while the comfortable
-we must make sure our home is well ventilated. temperature around 68 °F.
-hc-htahuwaowiremumhhosewieeduennaitwfsslliholeh,isidwrgesteharaohestahuwitculmishetmeoeiedmliedvtwiturciaytyastyp,rtt,teoiecowssrritatpuevyotsea,cpeecfpasuiuaoenrsslxrnlnioynhittomrgadutarueuihcvesrueoeitntmlfocgftiwaodhcwnnrairfoidaitndeueectrugrenkrahrsiinan,natgdndahtdoiecoornoronwp'etooeoaskfmnclopilncrwiabgrguanienreatdcdtoanaocrtdruoyaowsbuuiulefalnsnsodteieetrhsomicansuago.drnldtroieorn
reduce the water vapor inside the home. HYGROMETER

AIR HUMIDIFIER

https://www.alibaba.com/product-
detail/Temperature-Humidity-meter-
LCD-Household-Max_62221142827.html

references https://www.google.com/search?
Rachel Wray Thompson. (2018, June 7). Ideal Indoor Humidity Levels & How to Control Them at Home. Apartment Therapy; q=humidifier&sxsrf=AOaemvJK6lhjDLZBIi2uErFt-
Apartment Therapy, LLC. https://www.apartmenttherapy.com/hot-tip-use-a-humidifier-105471 iZVIVR3bg:1635954135888&source=lnms&tbm=is
ch&sa=X&sqi=2&ved=2ahUKEwipkI2JxPzzAhXaSPE
AcuRite Team. (2017, July 15). Maintaining Healthy Indoor Air Quality. Acurite.com; AcuRite. DHXZqClwQ_AUoAXoECAEQAw&biw=1536&bih=7
https://www.acurite.com/blog/home-monitoring-ideal-temperature-and-humidity-level-in-home.html
54&dpr=1.25#imgrc=B6E_xj7rrHyr8M
HSE - Thermal comfort: The six basic factors. (2021). Hse.gov.uk. https://www.hse.gov.uk/temperature/thermal/factors.htm

Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and its relationship with the long-term
variation of fog-haze events in the Yangtze River Delta. Atmospheric Environment, 193, 242–250.
https://doi.org/10.1016/j.atmosenv.2018.09.015

Vedantu. (2021, April 30). Relation Between Temperature and Humidity. VEDANTU; Vedantu.
https://www.vedantu.com/geography/relation-between-temperature-and-humidity

Temper& ature

HUMIDITY

?WHAT IS RELATIVE HUMIDITY

( ) ,It refers to the moisture content water vapor of the atmosphere

expressed as a percentage of the amount of moisture that can be

( - )retained by the atmosphere moisture holding capacity at a given
.temperature and pressure without condensation

The recommended indoor
20ºtemperature is between
C to
27ºC and the humidity level
30%should stays between
60% to

FACTORS AFFECTING RELATIVE Temperature
HUMIDITY Water vapour pressure
Rainfall
HOW TO CONTROL LOW AND HIGH Windspeed and direction

?HUMIDITY LEVELS AT HOME

Use an air conditioner Open a window Use dehumidifier Add some

it introduces cooler air while Outside air can assist it can reduce the houseplants
in reducing humidity
,removing warm humid air which levels humidity in the house help in boosting
.naturally helps lower humidity
humidity while

and also cleans the air naturally purifying the

conditioner filter to make it work air we breathe

better

REFERENCES NUR JANNAH BINTI
JAMALUDIN
. ( . .). - . . 5, 2021,relative humidity n d The Merriam Webster Com Dictionary Retrieved November from


:// . - . / / %20https www merriam webster com dictionary relativehumidity S59798

, ., , ., , ., , ., & , . (2018). -Liu W Han Y Li J Tian X QFZ3713
Liu Y Factors affecting relative humidity and its relationship with the long term

- . ,193, 242–250.variation offog haze events in the Yangtze River Delta Atmospheric Environment
https://doi.org/10.1016/j.atmosenv.2018.09.015
. ( . .). . 5, 2021, :// . . /Acurite GDPR Notice n d Acurite Blog Retrieved November
from https www acurite com gdpr heading

, 2019. (2019). . -Postharvest Technology of Perishable Horticultural Commodities
Relative humidity Relative Humidity

| . 7, 2021,an overview ScienceDirect Topics Retrieved November from

:// . . / / - - - / - .https www sciencedirect com topics agricultural and biological sciences relative humidity

TEMPERATURE Temperature: A measure of how
hot or cold something is!
& (measured in degrees)

HUMIDITY Humidity: Helps to determine
water vapour in the air



1 Relative
humidity?
what is it?

Relative humidity is when
at certain temperature, it
is measured as
percentage or ratio of the
number of water vapour
in a volume of air.

2 DID YOU KNOW?
Few factors affecting relative
humidity which are

Temperature

- the lower the temperature,

the higher the relative humidity

Amount of water

- the higher the amount of

3 WHat is the ideal water in air, the higher the relative
indoor temperature humidity

Aerosol emissions
Global warming

and humidity levels

for homes? HOW CAN WE

Ideally, the indoor CONTROL THESE?
temperature needs to

be at 20°C whereas

for the humidity levels

need to stay between INSTALL HEATING
30%-60% AND COOLING

OPEN THE SYSTEMS
WINDOWS OR
gas and electric furnaces
BLINDS reduce humidity with dry heat
whereas air conditioning lowers

By opening them, this will allow moisture levels as the air cools.
warmth to enter the house in winter


whereas as whole, opening the

window would help to allow better

airflow USE DEHUMIDIFIER

GROW PLANTS THAT control the humidity
ABSORB HUMIDITY levels

Some plants could remove reduce humid air from

moisture from the air which entering the house

could reduce energy

consumption and humidity levels

Example: Boston ferns NUR DAMIA NABILA
BINTI MOHAMMAD
References
KHAIRUL ANUAR
Contributor, C. V. |. (2021, April 13). What is relative humidity, and what's an ideal level for your home?
Molekule Blog. Retrieved November 7, 2021, from https://molekule.science/what-is-relative-humidity/. S59933
Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018, September 12). Factors affecting relative humidity and its
relationship with the long-term variation of fog-haze events in the Yangtze River Delta. Atmospheric
Environment. Retrieved November 7, 2021, from
https://www.sciencedirect.com/science/article/pii/S1352231018306071.
M, M. (2020, October 29). How to control moisture and humidity in the home | Lowe's. How to Achieve Ideal
Home Humidity Levels. Retrieved November 7, 2021, from https://www.lowes.com/n/how-to/controlling-
moisture-and-humidity-in-the-home.



"TEMPERATURE & HUMIDITY"

HUMAN WHAT FACTORS AFFECT

Humidity? relative humidity

Well it is How saturated a gas Humidity determined by THE
or a space is with water TEMPERATURE AND PRESSURE
vapour..woah hot spot! sooo OF THE SYSTEM OF INTEREST
- Cool air --> higher humidity
cloudy! This is commonly used than warm air
measure of humidity. (when same amount of water
(0%RH : DRY) vapour is present)
-As the temperature rises, -->
(100%RH : VERY HUMID) amount of water vapor required
to reach saturation rises as
Recommended indoor well.
temperature & humidity
3 FACTORS
levels at homes -->
stays between : that affected

30% i. Air temperature &
and relative humadity
60% ii. Rainfall, wind speed &
direction
lyecotoumnhet
o
rtwoeltlol:) iii. Sun radiation
Humidity is the most
Use Your Air Conditioner damaging component, which
Actively Use Your in combination with
Exhaust/Ventilation Fans fluctuating temperatures,,
Take Cooler Showers contributes to reduced usage
Fix Any Leaking Pipes parameters of built-in
Keep Your Gutters Clean materials.
Dry Your Laundry Outside
Get a Dehumidifier Nurfitry 'Aina Syamimi Binti Sharuddin
Move Your House Plants S60128
Use Charcoal Briquettes References:
Open a Window J.Dianne Dotson, April 23, 2018,
How The Sciencing, Temperature and Humidity

Are Related by

https://sciencing.com/temperature-ampamp-
humidity-related-7245642.html

RELATIVE HUMIDITY

Afifi Noraha Binti Mokhsin
S60249

1.) What is Relative 3.) How to control high
Humidity? and low humidity?

Relative Humidity is how saturated a To increase humidity:
gas (or a space) is with water vapour. Use a Humidifier
Add a Houseplant to your room
This is the most commonly used (add humidity through
measure of humidity, 0% RH – dry transpiration)
condition; 100% RH – very humid Use a water spray bottle to
spray a fine mist
condition.
To decrease humidity:

Use a Dehumidifier
Remove the houseplant from
What can affect the your room
humidity? Use air conditioner (introduce
coo; air while removing warm
Temperature air)
The higher the temperature, the
higher the humidity

2.) What are the recommended
humidity and indoor
temperature for home?

Humidity for home is between Reference:
30% and 60%
Recommended indoor AcuRite Team. (2017, July 15). Maintaining Healthy Indoor Air
temperature is 20℃ Quality. Acurite.com; AcuRite.
https://www.acurite.com/blog/home-monitoring-ideal-
The hygrometer is temperature-and-humidity-level-in-home.html
used to measure Husky Heating and Air Conditioning. (2018, May 30). Husky
Heating and Air Conditioning.
Humidity https://www.huskyair.com/blog/reducing-indoor-humidity/
Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors
affecting relative humidity and its relationship with the
long-term variation of fog-haze events in the Yangtze River
Delta. Atmospheric Environment, 193, 242–250.
https://doi.org/10.1016/j.atmosenv.2018.09.015
Oswald, E. (2018). How to Fix a Dry Room: 12 Ways to
Increase Humidity in Your Home | Weather Station Advisor.
Weather Station Advisor.
https://www.weatherstationadvisor.com/best-ways-to-
increase-humidity-in-your-home/

Temperature and Henry
Humidity Yap

S60322

What is Recommended Temperature and Humidity
relative
humidity? Most people are comfortable with 30% to 50%
relative humidity. However, to discourage the
How saturated growth and spread of mold, levels should be kept
a gas or a below 50%.

space is with The ideal indoor temperature at home is around
water vapour. 20-27 degrees Celcius for comfort.

FACTORS

RAINFALL WIND TEMPERATURE

Control high Control low
humidity humidity

Turn on air-conditioner Use humidifier
or fan Place houseplants indoor
Use dehumidifier Place a fountain in the
Open windows driest area
Do laundry outside Spray water with water
spray bottle

Ref ce
Os a d, E. (2020, Oc o r 5). How to Fix a Dr Ro m: 12 Way to In e s Hum y in Yo r Hom . We t
Sta Ad i r. h p ://w .we r at a v .co /be -wa -to-in se-hu t -in-yo -ho /
E. (2020, Aug 31). How Can I Red In o Hum y? Hus He t an Air Con on .
h p ://w .hu y .co /b o /re n -in -hu t /
La r He t Co l L . (2019, Jun 25). Wha is t e Ide Hom Hum y Lev For Yo r Fam ? La r
He t Co l & Plu n . h p ://la h a g.co /id -ho -hu t /
Cha l , N. (2021, Jul 7). Wha Is Rel e Hum y an How Do s It Af e t How I Fe l Out ?
How f s. h p ://s i c .ho t w s.co /na /c i t -we r/at p ic/qu on651.h

TEMPERATURE & HUMIDITY

WAN NUR IZZAH ALISSA BT WAN ROSLI
S60323

WHAT IS RELATIVE HUMIDITY?

Relative humidity is a percentage that compares the
amount of water vapor in the air at a specific
temperature to the maximum amount of water vapor
possible at that same temperature.

A relative humidity of 25%, for example, suggests that
the air has a quarter of its maximum water vapor
capacity.

RECOMMENDED INDOOR TEMPERATURE & HUMIDITY LEVELS

Ideal indoor humidity levels are between 30% and 50%

Ideal indoor temperature considered to be around 68 F (20 celcius)

Bedroom: requires 50% RH year-around as it helps to reduce mites

and allergens

HOW TO CONTROL LOW & HIGH HUMIDITY LEVELS AT HOME

Add humidifier Use exhaust fans
while cooking
They will provides moisture
into the air with with Use dehumidifier mainly in
airborne water droplet basements/during summer

FACTORS AFFECTING RELATIVE HUMIDITY:

TEMPERATURE WATER VAPOR POLLUTANTS(AEROSOL)

Both figures are Less significant Will promote the
theoretical analysis that than that of activation of nuclear
reveals the temperature temperature
condensation and
is the most important In order for RH to trigger fog under high
meteorological factor remain unchanged,
a larger increase of RH.
affecting relative water vapor needed If aerosol emission
humidity. to compensate for maintained status
quo, climate became
The larger amplitude of the effect of a cooling it will result in
variation in RH can be smaller increase of more fog & haze days
witnessed under low
temperature conditions. temperature

(Liu et al., 2018)

1.Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and its relationship with the long-term variation of fog-haze events in the Yangtze River Delta.
Atmospheric Environment, 193, 242–250. https://doi.org/10.1016/j.atmosenv.2018.09.015

2.What Is Relative Humidity and How Does It Affect How I Feel Outside? | HowStuffWorks. (2021). Retrieved November 7, 2021, from
https://science.howstuffworks.com/nature/climate-weather/atmospheric/question651.htm

3.Ideal Humidity Indoors & How to Control Humidity Levels | Apartment Therapy. (2019). Retrieved November 7, 2021, from https://www.apartmenttherapy.com/hot-tip-use-a-
humidifier-105471

RELATIVE HUMIDITY

NUR FARAHANANI Definition:
BINTI HUSSAINI
S60325 A measurement of the actual moisture
content of the atmosphere expressed as the

percentage of the amount that could exist
under the same conditions without

condensation. It is, therefore, not a direct
measure of any absolute quantity of water

vapor but merely a ratio between two
known values.




Recommended indoor Factors affecting
levels at homes: relative humidity:

indoor temperature Temperature
19 - 27 (high temperature,


low RH)
indoor humidity Water vapour
above 30 - 40
Air pollutant
How to control low & high
humidity levels at home?


References:

Anderson, D. B. (1936). Relative humidity or vapor pressure deficit. Ecology, 17(2), 277-
282.
Arundel, A. V., Sterling, E. M., Biggin, J. H., & Sterling, T. D. (1986). Indirect health effects
of relative humidity in indoor environments. Environmental health perspectives, 65, 351-
361
.Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and
its relationship with the long-term variation of fog-haze events in the Yangtze River Delta.
Atmospheric Environment, 193, 242-250.

Made by: Muhammad Amirul Haziq B. Mohd Yuzri (S61051)

Relative humidity

DEFINITION: RECOMMENDED INDOOR TEMPERATURE
& HUMIDITY LEVEL AT HOME
Humidity is the concentration
of water vapor in the air. Outdoor Indoor
> 50F MAX 50%
FACTORS AFFECT RELATIVE 25F – 50F MAX 40%
HUMIDITY 0F – 25F 30% – 40%
-20F – 0F 20% – 35%
Air Temperature < -20F 15% – 25%
When air temperature increases, air can hold
more water and relative humidity decreases. HOW TO CONTROL HUMIDITY LEVEL
When temperatures drop, relative humidity AT HOME
increases.
INCREASE
Radiant temperature
Thermal radiation is the heat that come from • Use humidifier
a warm object such as the sun, oven, hair
dryer and other hot surfaces. The increase It diffuses moisture to the air to avoid
of radiant temperature can decrease humidity dryness. (Clean them regularly to avoid
level. bacteria grow inside it)

Air velocity • Put an indoor fountain
The speed of air moving across the employee
may help cool them off the air is cooler Any source of water indoor will help to
than the environment. increase the humidity levels.

REFERENCES LOWER

• Posted by Tom Laurenzi on Feb 28, 2019. How does • Use air conditioning
temperature affect relative humidity meter readings?
Retrieved from https://www.delmhorst.com/blog/relative- It introduces cool air while remove warm
humidity-meter-readings air.

• Posted by Health and Safety Executive. Retrieved from • Use dehumidifier
https://www.hse.gov.uk/temperature/thermal/factors.htm#
radiant It pulls moisture/ water from
surroundings.
• Written by Cielo on January 4, 2021. Little-Known Ways
to Manage Your Ideal Indoor Humidity Throughout the
Year. Retrieved from
https://www.cielowigle.com/blog/ideal-indoor-humidity/

TEMPERATURE
AND HUMIDITY

WHAT IS RELATIVE
HUMIDITY ?

Relative humidity is a percentage that
represents the amount of water vapor in
the air at a given temperature compared
to the max possible water vapor amount

at that same temperature.

AMOUNT OF WATER VAPOR

If you increase the amount of RH decreases as temperature
water rises and increase as
temperature drops
in the air (by adding it due to
evaporation), Relative humidity

will go up FACTORS AFFECT
RELATIVE HUMIDITY
TEMPERATURE

Since warm air can hold more water

than cold air, if you lower the

temperature the Relative Humidity will

more water vapor = higher go up, even if you don’t add more

Relative Humidity water.

What are the

recommended indoor


temperature and Other than that
humidity levels for ,recommends indoor
humidity stays between
homes ?
30% and 60%
I know ! Depending on the

season, the ideal house
Why is it relative humidity ?
temperature for both comfort Because it depends on temperature .
For the same amount of water in volume
and efficiency is between 20℃ of air,the relative humidity could be 10%
to 27 ℃ or 100% depending on the temperature.




1.Use a Dehumidifier

If your indoor humidity levels like to hover 1.Reduce the amount of water
introduced into the home by cooking
at 65% or more, then it’s time to buy a HIGH
with covered pots; taking cooler,
LOWdehumidifier. With a whole house shorter showers; venting clothes
dryers directly to the outside; and
humidifier, you control humidity levels reducing the number of plants in the
with a device called a humidistat (yeah,
home.
like a thermostat), this method has the How to control low 2.Use exhaust fans while cooking and
greatest humidification capacity and and high humidity bathing, or open a window if there is
provides the most consistency overall
fresh, drier air outside
2.Grow Plants that Absorb Humidity levels at home ?


Some plants, like Boston ferns, remove

moisture from the air. Not only are you

reducing your humidity levels and energy

consumption, but you’re helping the

environment by removing more carbon

dioxide and adding more oxygen too!




REFERENCES

1.Relative Humidity – What Is It And Why Is It Important? (2012). Vaisala. Retrieved November 4, 2021, from
https://www.vaisala.com/en/blog/2018-10/relative-humidity-what-it-and-why-it-important

2.Acurite GDPR Notice. (2017, July 15). Acurite. Retrieved November 4, 2021, from https://www.acurite.com/gdpr
3.Ideal Indoor Humidity Levels & How to Control Them at Home. (2019, June 18). RACHEL WRAY THOMPSON. Retrieved November 4, 2021, from

https://www.apartmenttherapy.com/hot-tip-use-a-humidifier-105471

Humidity


1
Temperature

What is Humidity? 2

A measure of the amount of
water vapor in the air.

What is Relative Humidity ?

measures the amount of water in the
air in relation to the maximum amount
of water vapor (moisture). [1]

3 4 What factors affect
relative humidity?
Ideal indoor temperature and
humidity levels for homes temperature
water vapor [2]
But the ideal
level is changes
according to the

seasons. [5]

laeHnvodewlhstigoahtchhoounmmtreoid?liltoyw Dehumidifiers Lifestyle Changes
- It will add moisture to the air [4]
-Set the fan on your AC
When you see moisture accumulating, dry it promptly unit to “auto” instead of
“on
- Try not to run the AC
often [4]

and deal with the source of the problem

Interior Adjustment Air Conditioning Systems Norizati Yuhanis Binti
Zakaria

- Make sure to changes the interior which includes installing - It will remove moisture and S58138
humidity
ceiling fans, regularly cleaning your AC ducts and filters. - By installed the QFZ3713 (K2)
Proper ventilation appropriate size for the
square footage of the
- To improve air circulation in your house. property.[4]
- To avoid mold growth in the framing elements of the house
[3]

References

·Relative humidity – what is it and why is it important? Vaisala. (n.d.). Retrieved November 2, 2021, from https://www.vaisala.com/en/blog/2018-10/relative-humidity-what-it-and-why-it-important.
·Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and its relationship with the long-term variation of fog-haze events in the Yangtze River Delta. Atmospheric
Environment, 193, 242–250. https://doi.org/10.1016/j.atmosenv.2018.09.015
Causes of high humidity in your home & how to fix humidity. Home Climates. (2021, March 29). Retrieved November 2, 2021, from https://homeclimates.com/blog/tips-controlling-homes-
humidity#inside-humidity-tips.
How to control moisture and humidity in the home | Lowe's. https://www.lowes.com/. (n.d.). Retrieved November 8, 2021, from https://www.lowes.com/n/how-to/controlling-moisture-and-humidity-
in-the-home.
Written by Nic Rardin on July 20. (2021, October 20). What is the ideal humidity level for your house? HVAC Solutions. Retrieved November 2, 2021, from
https://www.hvac.com/humidity/recommended-humidity-level-home/.

AHMAD LUQMAN HAKIM BIN ROSIDI (S58164)




MEASUREMENT & INSTRUMENTATION

(QFZ 3713 )

MEASUREMENT OF WATER VAPOR

IN WATER-AIR MIXTURE
COMPARED TO MAXIMUM AMOUNT MEANING
POSSIBLE
HOW SATURATED A GAS OR A RELATIVE HUMIDITY
SPACE IS WITH WATER VAPOR

TEMPERATURE FACTORS
& AFFECTING

HUMIDITY DIFFERENCES IN TEMPERATURE
CAUSED BY HUMIDITY IN AIR
NUMBER OF HOUSEHOLD
AIR MOVEMENT
WIND SPEED
AIR PRESSURE
POLLUTANT IN THE AIR
TEMPERATURE
AMOUNT OF OPEN WATER

RECOMMENDED LEVEL
FOR INDOORS

A RECOMMENDED DEPENDING ON THE ROOM, EACH
LEVEL OF HUMIDITY IS HUMIDITY AND TEMPERATURE IS
AROUND 40% - 60%% DIFFERENT
WHILE THE RANGE OF FOR EXAMPLE LIVING ROOM
THE TEMPERATURE IS TEMPERATURE IS 20 DEGREE CELCIUS
BETWEEN 18 - 22 DEGREE AND HUMIDITY IS AROUND 40% - 60%
CELCIUS LOWER HUMIDITY LEVEL WILL
CAUSING DISCOMFORT, HEADACHE
AND STRESS
HIGH HUMIDITY WILL CAUSE MOULD
AND DUST MITES INCREASE

AHMAD LUQMAN HAKIM BIN ROSIDI (S58164)




MEASUREMENT & INSTRUMENTATION

(QFZ 3713 )

DURING SUMMER TURN ON

THE AIR CONDITIONER AND CONTROLLING TEMPERATURE
THE FANS TO LOWER THE
PERCEIVED TEMPERATURE &
ADN DEHUMIDIFY THE AIR HUMIDITY
IMPROVE BULDING'S
AIRTIGHTNESS OR THERMAL DURING WINTER, NEED TO
INSULATION TO COUNTER AIR MAKE SURE THE AIR
LEAKAGE AND TO CONTROL CIRCULATION IS PERFECT.
THE TEMPERATURE EASIER USING AN AIR EXCHANGER LIKE
HEAT RECOVERY VENTILATOR
(HRV) OR ENERGY RECOVERY
VENTILATOR WILL PREVENT
THE ROOMS COOING TOO MUCH
IF THE HUMIDITY IS TOO LOW,
USE PORTABLE HUMIDIFIER

REFERENCES

Relative humidity. Relative Humidity - an overview |
ScienceDirect Topics. (2011). Retrieved November 7, 2021,
from https://www.sciencedirect.com/topics/agricultural-
and-biological-sciences/relative-humidity.
http://www.libeo.com, L.-. (n.d.). Temperature and
humidity variations. {$cte.titre.en}. Retrieved November 7,
2021, from https://www.caaquebec.com/en/at-
home/guides/your-healthy-home-guide/temperature-and-
humidity-variations/.
http://www.libeo.com, L.-. (n.d.). Temperature and
humidity variations. {$cte.titre.en}. Retrieved November 7,
2021, from https://www.caaquebec.com/en/at-
home/guides/your-healthy-home-guide/temperature-and-
humidity-variations/.

By : LIANG XI LONG(S58227)

Relative Humidity(RH)

the percentage of the ratio of water vapor to the potential of water vapor
invisible water vapor in can contain in the air at given temperature

the air

Factors Affecting RH

Temperature Vapor
pressure

Optimal Indoor Humidity & Temperature?

30-60% of 20℃ for day time, 18℃ for
RH sleeping time

How to control low and high
humidity levels at home?

dehumidifier can reduce the humidity level when the air
is humid

humifier can increase the humidity level when the air is
dry

open window can reduce air humidity when it is high in
humidity

air conditioner can reduce the humidity at indoor house

plants help to increase the humidity level at indoor

Reference:
Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018, September 12). Factors affecting relative humidity and its relationship with the long-term variation of fog-haze
events in the Yangtze River Delta. Atmospheric Environment. Retrieved November 1, 2021, from
https://www.sciencedirect.com/science/article/abs/pii/S1352231018306071.
Babin, S. M. (n.d.). Water vapor myths: A brief tutorial. Retrieved November 1, 2021, from https://www2.atmos.umd.edu/~stevenb/vapor/.
Koster, L. (2016, February 16). The National Asthma Council Australia. National Asthma Council Australia. Retrieved November 2, 2021, from
https://www.nationalasthma.org.au/news/2016/indoor-humidity.
Team, A. R. (2020, August 7). Maintaining Healthy Indoor Air Quality. Welcome to AcuRite.com. Retrieved November 2, 2021, from
https://www.acurite.com/blog/home-monitoring-ideal-temperature-and-humidity-level-in-home.html.

Humidity QFZ3713 PENGUKURAN DAN PERALATAN
ILLIA AQILA BT MOHD TAIB S58421

Presence of water vapor in air(or any
other gas)

What is relative humidity?

Can be simply defined as the amount of water in the air
relative to the saturation amount the air can hold at given
temperature multiplied by 100.

FACTORS AFFECT RELATIVE HUMIDITY
Amount of Water Vapor
more water vapor = higher relative humidity

Temperature


Relative humidity decreases as temperature rises
and increases as temperature drop

RECOMMENDED INDOOR TEMPERATUR
E AND HUMIDITY LEVELS

FOR HOMES

30-60% 45-55% 55-80%

COMFORTABLE RECOMMENDED HIGH

HOW TO CONTROL HUMIDITY

TOO HUMID TOO DRY

Air conditioning A humidifier will

will help lower help increase
humidity. humidity.

REFERENCES

1.Is 70 Percent Humidity High • HumidityCheck.com. (2018, September 3). HumidityCheck.com. https://humiditycheck.com/is-70-percent-humidity-high

2.A Guide to Controlling NC Home Humidity | Newcomb and Company. (2019). Newcombandcompany.com. https://www.newcombandcompany.com/resources/how-do-i-control-

humidity-my-north-carolina-home



Temperature and

Humidity

By: Mohamad Azam Bin Jamilol Nasir

1. Define Relative Humidity. S58466
What factor affect
relative humidity? 1

2. What are the Relative humidity is basically
recommended indoor a way to describe how much
humidity is in the air to the
temperature and humidity point where if the ratio were
level for homes?
to go beyond 100%, it will
3. How to control low and basically rain. Temperature,
high humidity levels at moisture and air movement
home?
can affect humidity

2 3

According to the How to increase or
guidelines of Department decrease humidity
of Standard Malaysia, for
Dehumidifier Air humidifier
Malaysian climate, Air conditioner Open window
recommended Ventilation fan Indoor plants

temperature range is

23°C - 26°C, with 30%-60%

indoor humidity

Reference:
https://science.howstuffworks.com/nature/climate-

weather/atmospheric/question651.htm
https://www.huskyair.com/blog/reducing-indoor-humidity/

Relative Humidity Define Relative Huminity


The ratio of how much water vapour is in the
air to how much water vapour the air may By Ahmad Azamuddin Bin Mohamad
theoretically contain at a given temperature is (S58563)
known as relative humidity.

Factor that effect the relative humidity

1.Water Vapour

-The amount of water vapor needed to achieve saturation increases as the
temperature increases.

2.Temperature

-The increase in temperature due to global warming and AHIE is responsible for the
prominent descending trend of RH.

3.climate change

-The slower warming of the oceans means that there has not been enough moisture
evaporated and it will caused relative humidity decreased.

Recomended indoor humidity levels
temperature for home

Between 68 to 78 Between 30 and 50
degrees Fahrenheit is percent relative humidity
is optimum for health and
the optimal home
temperature for both comfort.
comfort and efficiency.

How to control low and high
humidity levels at home.

At high's humidity At low's humidity

Opening windows, leaving doors One of the most effective ways to
open throughout the house, raise the humidity in your home is
with the help of a humidifier.Simply
increasing ventilation and using using the stovetop more often also
exhaust fans can bring down
humidity levels. will help improve your home’s
humidity level.

References

Relative humidity and temperature. (n.d.). Retrieved November 8, 2021,
from https://manual.museum.wa.gov.au/book/export/html/89




Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018, September 12). Factors affecting relative humidity and its relationship with the
long-term variation of fog-haze events in the Yangtze River Delta. Atmospheric Environment (1994).
Retrieved November 8, 2021, from https://www.osti.gov/pages/servlets/purl/1473634.

TEMPERATURE AND HUMIDITY

HUMIDITY TEMPERATURE
The amount of water vapor in the air. [1] The degree of hotness or coldness of an object.[2]

RELATIVE HUMIDITY (RH) Factors affecting RH

The ratio of actual vapor pressure to [4]
the saturated vapor pressure. [3]
Temperature
- temperature increase, RH decrease

Water vapor
- water vapor increase, RH increase

HUMIDITY Ideal level for home TEMPERATURE
30-50% 26-30°C
[5] [6]

Thermo hygrometer
use to measures both
humidity of the air and
temperature of the air.[7]

HOW TO CONTROL HUMIDITY INDOOR

LOW HUMIDITY HIGH HUMIDITY

To increase humidity: To reduce humidity:

Use humidifier Use dehumidifier
Place plant inside Place plant outside
Hang laundry indoors Use air conditioner

-these action will add moisture to the air [5] - these action will remove moisture from air [8]

NATASHA ELLYNA BINTI YAACOB

S58568

REFERENCES QFZ3713(K2)

1.National Geographic Society. (2012, October 9). Humidity. National Geographic Society. Retrieved November 6, 2021, from https://www.nationalgeographic.org/encyclopedia/humidity/.
2.National Geographic Society. (2012, October 9). Temperature. National Geographic Society. Retrieved November 6, 2021, from https://www.nationalgeographic.org/encyclopedia/temperature/.
3.Wallace, J. M., & Hobbs, P. V. (2006). Atmospheric science: an introductory survey (Vol. 92). Elsevier.
4.Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and its relationship with the long-term variation of fog-haze events in the Yangtze River Delta. Atmospheric Environment, 193, 242-250.
5.Oswald, E. (2020, October 5). How to fix a dry room: 12 ways to increase humidity in your home. Weather Station Advisor. Retrieved November 6, 2021, from https://www.weatherstationadvisor.com/best-ways-to-

increase-humidity-in-your-home/.
6.Jamaludin, N., Mohammed, N. I., Khamidi, M. F., & Wahab, S. N. A. (2015). Thermal comfort of residential building in Malaysia at different micro-climates. Procedia-Social and Behavioral Sciences, 170, 613-623.
7.Instruments, P. C. E. I. U. K. T. (2021, November 7). Thermo hygrometer. Thermo Hygrometer | PCE Instruments. Retrieved November 8, 2021, from https://www.pce-instruments.com/english/measuring-

instruments/test-meters/thermo-hygrometer-kat_151815.htm.
8.10 cool ways to reduce indoor humidity - husky heating. Husky Heating and Air Conditioning. (2020, August 31). Retrieved November 6, 2021, from https://www.huskyair.com/blog/reducing-indoor-humidity/.

Definition Factors Affect

Relative Humidity

The quantity of water Air Temperature is the most important element
vapour in the air represented determining RH, followed by the influence of specific
as a percentage of what is required for temperature humidity & the direct contribution of air pollutants.
saturation at the same temperature.



radiant Radiant heat may be present in an environment if there
are heat sources.
temperature
Radiant temperature has a higher effect on how we

lose/gain heat to the environment than air temperature.

Examples: sun, fire, electric fires, ovens, kiln walls, cookers,
dryers, hot surfaces & machinery, molten metals

Outdoor Temperature Optimal Indoor Humidity Level Air This defines the rate at which air moves across the


velocity employee & may aid in cooling them if the air is colder
than the surrounding environment.
Higher than 50°F Max. 45%
25°F to 50°F Max. 40% For example, air velocity is a significant component in
0°F to 25°F 30% – 40% thermal comfort:
20% – 30%
-20°F to 0°F 15% – 20% Still/stagnant air in artificially heated interior situations
Below -20°F can make individuals feel stuffy. It may also result in an
increase in odour..

REFERENCES how to control low & high
humidity level at home ?
Written by Nic Rardin on July 20. (2021, October 20). What is the ideal humidity level for your

house? HVAC Solutions. Retrieved November 6, 2021, from
https://www.hvac.com/humidity/recommended-humidity-level-home/. Make Use of Your Air Conditioner
Written by Nic Rardin on July 20. (2021, October 20). What is the ideal humidity level for your
house? HVAC Solutions. Retrieved November 6, 2021, from Because it introduces cooler air while removing warm, humid air, your
https://www.hvac.com/humidity/recommended-humidity-level-home/. air conditioner naturally helps reduce interior humidity.

S58851 Maintain the cleanliness of your gutters
WAN MOHAMMAD IQBAL HAKIMI BIN WAN RITIHAUDDEEN
QFZ 3713 (K2) It is critical to clear your gutters and ensure that your downspouts are
directed away from your property and stretch at least 6 feet.

Make Active Use of Exhaust/Ventilation Fans

Keep them on a bit longer after you've finished your activity, rather
than turning them off. This will go a long way toward lowering interior
humidity.

Make a Window Open

Sometimes simply opening a window will assist to reduce & lower
humidity levels.

Temperature NUR ADHAWANI BILAH IZZAH
BINTI MOHD JAMALI
& S58855

Humidity FACULTY OF SCIENCE &
MARINE ENVIRONMENT

1what is relative humidity? 2 what factors affect relative humidity?

The amount of water vapour (vapour Temperature: Because warm air can store
pressure) in the air is referred to as more water than cold air, lowering the

relative humidity. temperature will increase Relative Humidity,

even if no additional water is added.


It's a proportion of the amount of
moisture that the air can store. The Amount of water : Relative humidity will
actual moisture content of the air, the increase if the amount of water in the air is
increased (by adding it due to evaporation).
temperature, and the barometric
pressure all contribute to relative

humidity.

- Temperature and geographic location have an
impact on relative humidity.

- Warmer weather boosts evaporation because
warmer air stores more moisture than cooler air.

what are the recommended indoor 3 4 how to control low and high humidity
levels at home?
temperature and humidity levels for homes?

A humidity level of 30-50 percent strikes 1.Use the air conditioner
a balance between too much and too - Because it introduces cooler air while removing
little moisture, ensuring that you and warm, humid air, the air conditioner naturally helps to
your home are both comfortable.
The ideal house temperature for minimise indoor humidity.
comfort and efficiency, depending on Maintain humidity control by having the air conditioner
the season, is between 68 and 78
degrees Fahrenheit. serviced and changing the filter on a regular basis.

What is an uncomfortably high

humidity level?
2. Use the ventilation fans actively
A relative humidity level of 30-50 - Use the ventilation fans when cooking on a hot burner.
percent is ideal for most people. Higher
Keep them on a little longer than usual, even if we
amounts are uncomfortable because
the air contains too much moisture, generally turn them off when we're done with the
causing people to sweat and become
activity. This will go a long way toward lowering interior
unable to chill down.
humidity.
REFERENCES
1. Bannister, M. (2021, August 1). How humidity damages your home - and how to fight it.


Airthings. Retrieved November 4, 2021, from https://www.airthings.com/resources/home- 3. Avoid drying clothes indoor

humidity-damage.
- If you live somewhere with a lot of humidity, drying
2. Causes of high humidity in your home & how to fix humidity. Home Climates. (2021, March
29). Retrieved November 4, 2021, from https://homeclimates.com/blog/tips-controlling- clothes indoors is not a good idea. When wet towels or
homes-humidity.
other objects are hung on radiators, humidity is created
3. Chandler, N. (2021, July 7). What is relative humidity and how does it affect how I feel outside?
HowStuffWorks Science. Retrieved November 4, 2021, from as the moisture evaporates, increasing the danger of

https://science.howstuffworks.com/nature/climate-weather/atmospheric/question651.htm. humidity damage in the home.






4. Install indoor air quality monitors.

- You will be notified of any potential issues, and have

historical data to see where persistent issues arise.

Humidity sensors are an essential component of any air

quality monitor because they provide a detailed

understanding of potential moisture issues in our

homes.

QFZ3731 Relative
Measurement & Humidity
Instrumentation

NORSAKINAH BINTI
ZULKIFLI (S58864)

DEFINE RELATIVE HUMIDITY (RH)

Percentage that represents the
amount of water vapor in the air.

RECOMMENDED INDOOR TEMPERATURE AND
HUMIDITY LEVELS FOR HOMES

Malaysia is tropical country. Average temperature
for Malaysia 23°C to 30°C. Relative Humidity
comfortable is 30% – 60% but recommended:
45% – 55%

CONTROL LOW AND HIGH HUMINITY LEVEL AT HOME

We need to control level of humidity cause it can effect to our health
such as hyperthermia. It cause of high humidity and over heating. While
low humidity cause chronic dry skin, asthma and allergy symptoms

To Control Low Huminity Level To Control High Huminity Level

• Humidifier • Dehumidifier

• Air Conditioners • Exhaust Fans

• Fans • Air Conditioners

• https://core.ac.uk/download/pdf/82494923.pdf
• https://www.cdc.gov/niosh/topics/indoorenv/temperature.html
• https://www.cielowigle.com/blog/ideal-home-humidity-levels/
• https://homeclimates.com/blog/tips-controlling-homes-humidity
• https://www.andatechdistribution.com.au/blogs/resources/reduce-indoor-humidity-without-dehumidifier
• https://sullivanheatingandcooling.com/blogs/5-surprising-effects-homes-humidity-human-body
• https://www.nbcnews.com/health/health-news/it-s-not-just-heat-it-really-humidity-know-risks-n629486

AQILAH SYAHIRAH BINTI MOHD AZHAR (S59158) QFZ3713

Temperature & Humidity

RELATIVE HUMIDITY is a percentage that represents the amount
of water vapor in the air at a given temperature compared to the

- - - - - - - - - - - - - - - - - - - - - -max possible water vapor amount at that same temperature

FACTORS AFFECT RELATIVE HUMIDITY :

TEMPERATURE
RAINFALL
WIND SPEED AND DIRECTION

----------------------
Environment Protection Agency (EPA) recommended
indoor humidity stays between 30% to 60% . For
comfortable indoor temperature at home around 20-
27 degree Celcius.

----------------------

use dehumidifier SEVERAL WAYS TO CONTROL LOW
AND HIGH HUMIDITY LEVELS AT

HOME

run exhaust fans

do laundry outside clean air grow plants that
absorb humidity
conditioner filter

REFERENCE

payless power. (2018, July 30). HOW TO LOWER HUMIDITY INDOORS. Retrieved November 7, 2021, from
https://paylesspower.com/blog/how-to-lower-humidity-in-house/
How Can I Reduce Indoor Humidity. (2018, May 30). Husky Heating & Air Conditioning. Retrieved November 7,
2021, from https://www.huskyair.com/blog/reducing-indoor-humidity/
Kong, F., & Singh, R. P. (2011). Relative humidity. Science Direct. Retrieved November 7, 2021, from
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/relative-humidity
Tuck, N. G. W. A. I., & Ahmad Zaki, S. H. E. I. K. H. (2019, September 4). Investigation of Indoor Thermal
Environments in a Two-Story Corner Terrace House in Malaysia. Knowledge. Retrieved November 7, 2021, from
https://knepublishing.com/index.php/Kne-Social/article/view/4996/10003

WAN MUHAMMAD HAKIM BIN WAN ADNAN S59238

Temperature & Humidity

Relative Humidity? What factors affect
relative humidity?




MEASURE OF HOW
MUCH WATER VAPOR TEMPERATURE PRESSURE
IN A WATER-AIR
MIXTURE COMPOUND “As air temperature “As pressure increase, air
TO THE MAXIMUM increases, air can hold more temperature will decreases,
AMOUNT POSSIBLE air cannot hold more water
water molecules, and its molecules, and its relative
relative humidity decreases.
humidity will increase.
When temperatures drop,

relative humidity increases.”
Ideal indoor Te
mperature &


Humidity
TURE

TEMPERA
How to control IN SUMMER : 78 DEGREES

Humidity at homes?
FARANHEIT
IDITY

HUMIN WINTER : 68 DEGREES
FARANHEIT -ACCORDING TO MAYO
CLINIC, 30-50% HUMIDITY
REMOVING HUMIDITY AT SOURCE, FOR EXAMPLE, USING AN EXTRACT FAN IN THE (OUTDATED)
BATHROOM, USING A RANGEHOOD IN THE KITCHEN, VENTING A DRYER TO THE OUTSIDE -ACCORDING TO RECENT
AND USING ONLY EXTERNALLY VENTED GAS HEATERS RESEARCH, 40-60%
HUMIDITY (UPDATED)
PASSIVE VENTILATION BY OPENING WINDOWS. BRANZ TESTING HAS FOUND THAT
OPENING WINDOWS WIDE FOR JUST 10–15 MINUTES EACH DAY CAN LOWER MOISTURE
LEVELS INSIDE A HOUSE

·RAISING INDOOR TEMPERATURES BY EFFECTIVE INSULATION AND HEATING. DATA FROM
BRANZ RESEARCH SHOWS THAT HOUSES HEATED TO 18˚C EXPERIENCE FAR FEWER
PERIODS OF HIGH HUMIDITY

RUNNING A WHOLE-HOUSE HUMIDIFIER THAT MAY ALLOW YOU TO SET THE REFFERENCES
TEMPERATURE BACK A DEGREE OR TWO WITHOUT FEELING UNCOMFORTABLE.




1. CHRISTOPHER W. CALLAHAN, DONALD L. FENTON. (2019). RELATIVE HUMIDITY - AN OVERVIEW |
SCIENCEDIRECT TOPICS. RETRIED FROM : HTTPS://WWW.SCIENCEDIRECT.COM/TOPICS/AGRICULTURAL-AND-
BIOLOGICAL-SCIENCES/RELATIVE-HUMIDITY

2.LAURENZI T. (2019). HOW DOES TEMPERATURE AFFECT RELATIVE HUMIDITY METER READINGS?. RETRIEVED
FROM : HTTPS://WWW.DELMHORST.COM/BLOG/RELATIVE-HUMIDITY-METER-READINGS

3.ANONYMOUS, (2021). WHAT IS THE IDEAL HOUSE TEMPERATURE? – AIRE SERV. RETRIEVED FROM :
HTTPS://WWW.AIRESERV.COM/ABOUT/BLOG/2018/APRIL/WHAT-IS-THE-IDEAL-HOUSE-TEMPERATURE-/

4.ANONYMOUS, (2021), HUMIDITY AND CONDENSATION IN A BUILDING - HOW TO CONTROL IT. RETRIEVED FROM :
HTTPS://WWW.LEVEL.ORG.NZ/PASSIVE-DESIGN/CONTROLLING-INDOOR-AIR-QUALITY/HUMIDITY-AND-
CONDENSATION/

Relative Humidity

Definition of Relative Humidity

The proportion of water vapour that is actually
present in the air to the maximum quantity that

may be produced at the same temperature

The most important factor affecting RH is temperature,
followed by water vapour pressure.

There are several ways to control low and high
humidity levels at home.

1) Use air conditioner - Because it introduces cooler air while removing
warm, humid air, an air conditioner naturally helps to lower indoor
humidity.
2) Open a window - Simply opening a window can assist to reduce
humidity levels.
3) Add some houseplants - Houseplants are a great method to boost
humidity while also potentially purifying the air you breathe.

The recommended indoor temperature
is 20°C and the recommended indoor
humidity is stays between 30% and 60%

relative humidity. (n.d.). The Merriam-Webster.Com Dictionary. Retrieved November SYAHMI AIMAN BIN SHAFI'EE
5, 2021, from https://www.merriam-webster.com/dictionary/relative%20humidity S59274

Liu, W., Han, Y., Li, J., Tian, X., & Liu, Y. (2018). Factors affecting relative humidity and
its relationship with the long-term variation of fog-haze events in the Yangtze River
Delta. Atmospheric Environment, 193, 242–250.
https://doi.org/10.1016/j.atmosenv.2018.09.015



Acurite GDPR Notice. (n.d.). Acurite Blog. Retrieved November 5, 2021, from
https://www.acurite.com/gdpr



QFZ 3713 PENGUKURAN DAN PERALATAN ASSIGNMENT 1
ELVIAN MASLI (S59359)
What factors affect "relative humidity"?
What is
"relative humidity"? ✅ Amount of water vapor.
The more water vapor in air,
Relative humidity (RH) refers to the moisture the higher the relative
content (i.e., water vapor) of the atmosphere, humidity.
expressed as a percentage of the amount of moisture ✅ Temperature.
that can be retained by the atmosphere (moisture- As temperature increases,
holding capacity) at a given temperature and relative humidity decreases.
pressure without condensation.

Recommended indoor temperature
and humidity for homes.

Indoor humidity, and temperature levels can play
an important role to our household’s health,
particularly for people with asthma or allergies,
mould and fungi development, and currently, the
transmission rate of viruses like COVID-19.

✅✅

20-25°C 30-50%

What if my indoor humidity level are too high or too low?

How to control low humidity level How to control high humidity level
at home: at home:
Humidifiers,
Open the windows (outside more humid), Ventilation and improved air circulation,
Evaporative air conditioners, Dehumidifiers,
Houseplants
Refrigerated air conditioners,
Extraction fans.

Sources

1. Yahia, E., 2019. Relative Humidity. Postharvest Technology of Perishable Horticultural Commodities,.
2. Qsstudy.com. 2021. Importance of determination of Relative Humidity - QS Study. [online] Available at:

<https://qsstudy.com/physics/importance-determination-relative-humidity>
3, Indoor humidity levels. Sensitive Choice. (2021, August 10). Retrieved November 5, 2021, from

https://www.sensitivechoice.com/resource/indoor-humidity-levels.

RELATIVE HUMIDITY

The amount of water vapor in the
air, expressed as a percentage of the
maximum amount that the air could
hold at the given temperature; the

ratio of the actual water vapor
pressure to the saturation vapor

pressure

Factors affect Relative humidity

Temperature is the factor
influencing relative humidity
followed by water vapor pressure.
A larger increase of water vapor
is needed to compensate for the
effect of a smaller increase of

Temperature

What are the recommended indoor h urmaeiccdoc3i tmo0yrm%desaintnndagde,yTds6h0iebn%ed.EtoPwoAre e n
temperature and Comfortable room temperatures
are generally considered to be
humidity levels for homes? around 68° Fahrenheit. At night,
some sleep experts recommend
to Monitor and maintain ideal home keeping a bedroom around 65°F
humidity and temperature.

HOW TO CONTROL LOW HUMIDITY
when low humidity level
To prevent low humidity in your home,
Issues: you should find ways to add more
1. Itchy or dry skin moisture into the air. might to
2. More vulnerable to cold and infection consider installing air conditioning
3.Damage to wood furniture and hardwood or a humidifier to get

floors

the conditions right. How to control low and high

when HIGH humidity level

Issues: HOW TO CONTROL high HUMIDITY humidity levels at home?
1.High humidity promotes the growth and

spread of mold To help combat high humidity problems,
2.Those who suffer from asthma and heat your home properly, use
allergies may experience worsened
symptoms ventilation, and keep moisture-creating
3.Trouble sleeping in uncomfortable activities to a minimum. Ventilation is
conditions
4.Moisture problems in your home – You key, and the simplest remedy is often to
might notice condensation on your open windows, which will carry the
moisture away

windows. This excessive moisture can cause S59364
damage to your furniture and fixtures

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