Heat- Expansion and Contraction

THURSDAY 23 SEPTEMBER 2021

PdPR SCIENCE 5 DLP
TIME : 8.30am – 10.00am

TOPIC : 6. HEAT

CONTENT STANDARD:
6.1 Heat and Temperature

LEARNING STANDARD:
6.1.5 Conclude effects on materials when they gain and lose

heat by carrying out activities.

LEARNING OBJECTIVE:
At the end of this lesson, pupils are able to:

1. State that materials can expand and contract.

SUCCESS CRITERIA:
At the end of this lesson, pupils are able to:

1. Explain through examples the expansion and contraction of
materials in terms of gaining and losing heat.

************************************************************************

1

EXPANSION AND CONTRACTION OF MATTER
( Pengembangan dan pengecutan bahan )

1. Matter is made up of a small particles called atoms. It exists
as solid, liquid and gases.

2. When matter is heated, it gains heat. The heat energy
causes the atoms to move faster.

3. The atoms begin to move away from each other. As a result,
the volume of matter increases and the matter expands.

Atoms become far apart when heated

4. When a matter is cooled, the atoms in it lose heat energy
and move slowly.

5. The atoms become closer to each other. As a result, the
volume of matter decreases and the matter contracts.

Atoms become closer when cooled

2

3

SOLID ( PEPEJAL)

1. After being heated for a few minutes, the metal ball is unable
to pass through the metal ring. This shows that the metal ball
expands and its volume increases when heated.

2. After the metal ball is allowed to cool, it is able to pass
through the metal ring. This shows that the metal ball
contracts and its volume decreases when cooled.

LIQUID ( CECAIR)

Liquid expands when heated and contracts when cooled.

4

GAS
Gas expands when heated and contracts when cooled.

5

6

Step Observation Inference
Because the metal
Step1 The metal ball can ball contracts and
does not receive
pass through the heat.
Because the metal
ring. ball expands when
being heated.
Step The metal ball Because the metal
3 cannot pass ball contracts when
through the ring. being cooled.
Step The metal ball can
5 pass through the
ring again.

Conclusion:

Solid expands when it gains heat and contracts
when it loses heat.

7

8

Step Observation Inference

Step 3 The level of Because coloured

coloured water in water expands when

the glass tube heated.

rises.

Step 4 The level of Because coloured

coloured water in water contracts

the glass tube falls. when cooled.

Conclusion:

Liquid expands when it gains heat and
contracts when it loses heat.

9

10

Step Observation Inference

Step 2 The balloon Because the gas

expands when the inside the bottle

empty bottle is expands when

heated. heated.

Step 3 The balloon shrinks Because the gas

when the empty inside the bottle

bottle is cooled. contracts when

cooled.

Conclusion:

Gas expands when it gains heat and contracts
when it loses heat.

Conclusion based on the results of activity 1,2
and 3.

Solid, liquid and gas expands when it gains
heat and contracts when it loses heat.

11