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Q.

The warm air is?

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a

lighter than the cold air

b

heavier than the cold air

c

equal to the weight of cold air

d

none of the above

answer is A.

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Detailed Solution

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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