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Standard VII
Physics
Warm Air and Cool Air
Question

Why is warm air lighter than cold air?
  1. Due to heating, air contracts. When same mass occupies less volume it becomes lighter.
  2. Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.
  3. Due to heating, air expands. When same mass occupies more volume it becomes lighter.
  4. Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.

A
Due to heating, air contracts. When same mass occupies less volume it becomes lighter.
B
Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.
C
Due to heating, air expands. When same mass occupies more volume it becomes lighter.
D
Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.
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Solution
Verified by Toppr

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 is lesser. The warm air rises up since it is lighter. The less denser air floats in the much denser air just like ice floats on water as ice is is less dense than water.

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Similar Questions
Q1
Why is warm air lighter than cold air?
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Q2
Cold air is lighter and less dense than warm air.
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Q3
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.
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Q4
(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.
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Q5
Warm air is lighter than cool air.
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