Question

explain an activity to show that air expands on heating

Answer 1

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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.

Answer 2

ACTIVITY:

1. TAKE 250 ml OF BEAKER.
2. POUR 100 ml OF WATER IN IT.
3. ADD 2g OF SALT.
4. SHAKE IT WELL.
5. NOW ADD 1g of SALT IN IT.
6. THE 1g OF SALT IS NOT PROPERLY MIXED IN IT.
7. BOIL THE WATER FOR 3-5 min.
8. AFTER BOILING THE SALT PROPERLY DISSOLVES IN IT.