Question

give two examples of air expands on heating and contracts on cooling​

Answer 1

Answer:

iron, aluminum

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Answer 2

Answer:

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.

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