2. HEAT – Transfer of Heat
Learning Objectives:
The students will be able to
 To define transfer of heat.
 To explain about transfer of heat in solids through
conduction.

3. Starter Activity
Think and answer:
 Have you ever touched the frying pan kept on flame by mistake?
How it feels?
 When the pan is removed from the flame it slowly cools down,
why does it cool?

4. Answer
 When the pan is removed from the fire, it slowly
cools down. The heat is transferred from
the pan to the surroundings since heat flows from
a hotter object to a colder object.

5. Conduction:
 Conduction of heat from hot end of metal spoon to its colder end:
 Heat is transferred from the hot end of the metal spoon to
its cold end.
 A transfer of heat from the hot part of a material to its
colder part (without the movement of material as a whole)
is called conduction.

11.  Uses of Good Conductors and Poor Conductors of Heat:
 All metals are good conductors of heat and they are different in
conducting the heat, which means that some metals conduct the heat faster
than the other. The heat makes us comfortable and helps us to prepare our
food and it is an interesting form of energy.
 Things which are bad conductors of heat are used as insulators. In some
occasions it is important:
 1. Prevent heat loss from a hot body.
 2. Prevent heat from entering cold body.
 3. Fur, wool, cotton wool, cork, feathers, sawdust, trapped air in birds'
feathers, etc.

15. Video Time: https://www.youtube.com/watch?v=VwTpMhH34ro- Conduction

16. Question time:
 Define transfer of heat.
 Why is it suggested to use two thin blankets instead of one
thick woolen blanket in winter season?
 The cooking utensils are made up of metal. Why?

17. Learning Outcomes:
The students are able to
 Define transfer of heat.
 Explain about transfer of heat in solids through
conduction.

18. Home work/Assignment
• Read pages- 48 to 52 from your textbook.
 (Interdisciplinary with SST)
 Collect information about El Nino and La Nina effects.
Do it in your note book .(upload it in homework section of your class
notebook.)