Have you observed water boiling in a vessel with a lid on it? What do

1.	Have you observed water boiling in a vessel with a lid on it? What do you notice? How can you establish that heat is a form of energy?
Answer» 1. We know that boiled water is being converted to water vapour. 2. The volume of the water vapour increases. 3. The increased volume of vapour tries to go out. In this process it tries to lift the lid up. 4. We need energy to lift any object. This energy comes from the heated water. 5. Water gets the energy from the heat of the fire. Thus heat is a form of energy:

Have you observed water boiling in a vessel with a lid on it? What do you notice? How can you establish that heat is a form of energy?

Answer»

1. We know that boiled water is being converted to water vapour.

2. The volume of the water vapour increases.

3. The increased volume of vapour tries to go out. In this process it tries to lift the lid up.

4. We need energy to lift any object. This energy comes from the heated water.

5. Water gets the energy from the heat of the fire. Thus heat is a form of energy: