Q.

Why does warm air rise?

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a

It is denser than the cool air

b

It is equally dense as the cool air

c

It does not experience gravity

d

It is less dense than the cool air

answer is A.

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Detailed Solution

  • When heat is provided to air, particles in the air start vibrating vigorously due to which they move away from each other. 
  • Therefore, the density of the warm air becomes less than the cool air and as a result, the cool air sinks and the warm air rises.
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