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Q.

The warm air is?

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a

heavier than the cold air

b

lighter than the cold air

c

none of the above

d

equal to the weight of cold air

answer is A.

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Detailed Solution

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Warm air is lighter than cold air because on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter and smaller. The warm air rises up since it is lighter.

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