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Density of Hot and Cold Air

Warm air is l...

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Warm air is lighter than cool air.

A

True

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B

False

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Q. (a) Fill in the blanks with appropriate words.
When air _______________(heats/cools), the air molecules _____________(spread out/come closer) so that there are fewer air molecules in the same space. _______________(Warm/Cool) air weighs less than _______________ (Warm/Cool) air, which means that warm air presses down on the earth less than cool air. Less pressing means _____________ (less/more) pressure. Thus, a mass of warm air creates an area of low pressure. Warm air rises and produces clouds. So, _______________ (low/high)pressure areas usually bring rain or storms.
(b) Now, explain how high pressure areas are associated with clear skies.

Q. Fill in the blanks with the correct words.

1. Wind is caused by .................... (actual/difference) in temperatures of different regions.
2. As air gets warmer, it .................... (contracts/expands).
3. Cool air is .................... (lighter/heavier) than warm air
4. Monsoon winds carry .................... (dust/rain)
5. Moving air can provide a .................... (gravity/lift).

Q. Warm air is lighter than cool air.

Q. Which of the following statements are correct regarding warm and cold air?
1. Warm air is lighter than cold air.
2. Warm air rises up.
3. Cold air sinks down.
4. Cold air is lighter than warm air.

Q. Why is warm air lighter than cold air?

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