Page 43 - Science Class 6 Times Publication

Chapter
Chapter

4 HEAT

Estimated periods:7

OBJECTIVES

At the end of the lesson, the students will be able to :

Ü dene heat.
t
Ü ell and explain sources of heat.

Ü xplain effects of heat.
e
Ü xplain uses of heat.
e
e

Ü xplain the meaning and uses of absorption of heat.
MIND OPENERS
Ü What do you use to cook food?
Ü What happens to ice when you heat it?
Ü What happens if there is no sun?
Ü Can you say some uses of heat?

Introduction

When there is cold in winter, you want to sit near the re or in the

sunshine. You feel warm when you move towards the re. Fire and
the sun give us heat.

Thus, heat is a form of energy which gives the sensation of warmth.
The SI unit of heat is Joule (J). It can be measured in calorie also.

1 calorie = 4.2 Joules.
Heat is needed to run vehicles, engines, etc. It is also needed to keep
our body warm. We use solar heat for drying clothes, food grains,
pulses, etc.

Heat is used to turn water into steam and run engines. For example,
steam engine which was invented by James Watt used to work by the
steam that is produced from water after heating.

Times' Crucial Science and Environment 39 Book 6