Question

Write any activity to show that uneven heating of air.​

Answer 1

Introduction:-

Air expands on heating. Why does this happen? It is because the particles of air on becoming warm, move away from each other and take up more space. So we can say that air on becoming hot occupies more space. Since the particles move away from each other, the air becomes less dense and lighter in weight.

As a result, warm air rises up. On the contrary, on cooling the particles of air come closer to each other. Due to this, the volume of air becomes less, the air becomes more dense and heavier. This can be demonstrated by a simple activity.

→=Activity I=←

Materials Required:

balloons, trough, ice cold water, hot water, bottle

Method:

Take a bottle. Tie the balloon tightly on the neck of the bottle. Place the bottle in a container having hot water. Record your observation. Now place the bottle in cold water. Again observe.

Observation:

When the bottle is placed in hot water, the balloon expands. When the bottle is placed in cold water, it contracts.

Inference:

This happens because when the bottle is placed in hot water, the air in it becomes warm and expands due to which balloon also expands. When the bottle is placed in cold water, the air in the bottle contracts due to which balloon also contracts.

Daily life examples where you can see the air expands on hearing.

Hot air balloon rises up: This is because the air in the balloon expands on heating. It also becomes lighter hence rises up.

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