EXPANSION AND CONTRACTION

HEAT

EXPANSION AND
CONTRACTION OF MATERIALS
(Pengembangan Dan Pengecutan Bahan)

LEARNING OBJECTIVES

By the end of this lesson, pupils are able to :-

State that material expands when it gains heat and contracts when it
loses heat by observing the activities such as:

heating ring and the heating and cooling of immersing a bottle
iron ball coloured water in with a balloon on its
mouth into hot water
glass tube
and ice



What causes the bottle cap
to pop off?

The air in the drinking bottle expanded when it
gained heat from the hot water. This causes the

bottle cap to pop off.

Udara yang terdapat dalam botol minuman
mengembang apabila menerima haba dari air panas.
Keadaan ini menyebabkan penutup botol terbuka.



How can the overlapping
glasses be separated?

When the ice cubes are put into the glasses, the
glasses will contract because they lose heat.

Thus, the overlapping glasses can be separated.

Apabila ketulan ais diletakkan ke dalam gelas kaca,
gelas akan mengecut kerana kehilangan haba. Oleh

itu, gelas yang bertindan dapat dipisahkan.

LET’S TEST

Page
155

Page
156

Page
157

Summary

i-Think Map
Thinking Process

cause and effect

Multi – Flow Map

metal ball is metal ball can not
heated pass through the

metal ring

a conical flask is EXPANSION level of coloured
placed into a glass situation water rises
container filled with
the balloon inflates
hot water
effect
plastic bottle is
immersed into a
glass container
filled with hot water

cause

Multi – Flow Map

metal ball metal ball can
is cooled pass through the

metal ring

a conical flask is CONTRACTION level of coloured
placed into a glass water lowers
container filled with situation
the balloon
cold water deflates

plastic bottle is effect
immersed into a
glass container
filled with cold

water

cause

RUMUSAN

Peta i-Think
Proses Pemikiran

sebab dan akibat

Peta Pelbagai Alir

bebola besi bebola besi tidak
dipanaskan dapat melalui
gelang besi

kelalang kon PENGEMBANGAN aras air bewarna
diletakkan ke meningkat
dalam besen kaca kejadian
yang berisi air belon
mengembang
panas
akibat
botol plastik
direndamkan ke
dalam besen kaca

yang berisi air
panas

sebab

Peta Pelbagai Alir

bebola besi bebola besi dapat
disejukkan melalui gelang
besi

kelalang kon PENGECUTAN aras air bewarna
diletakkan ke menurun
dalam besen kaca kejadian
yang berisi ais belon mengecut

botol plastik akibat
direndamkan ke
dalam besen kaca

yang berisi ais

sebab

CONCLUSION

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

Bahan akan mengembang apabila
menerima haba dan mengecut apabila

kehilangan haba.

Thanks!

Science Is Easy
Teacher Hikmah

#lovewhatyoudo