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Question

Which of the following statement(s) is/are correct regarding warm and cold air?
  1. Warm air is lighter than cold air.
  2. Warm air rises up.
  3. Cold air descends.
  4. Cold air is lighter than warm air.


Solution

The correct options are
A Warm air is lighter than cold air.
B Warm air rises up.
C Cold air descends.
Warm air is lighter than the cold air. When air gets heated up it expands, occupies a larger volume and becomes less dense than the air surrounding it. Hence, the warm air rises and the cold air descends.

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