Question

Explain with the help of an activity, that hot air expands and rises up.

Answer 1

Explanation:

Air molecules expand on heating and contract on cooling. Hot air molecules take more space than cold air molecules. Warm or Hot air is lighter than cool air. Warm air, like smoke, rises up and cool air settles down.

Answer 2

Answer:

Answers:-

1) Air molecules expand on heating and contract on cooling. Hot air molecules take more space than cold air molecules. Warm or Hot air is lighter than cool air. Warm air, like smoke, rises up and cool air settles down.

2) 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.