What is meant by saying that air expand on heating?
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When we heat air, it's interparticle force of attraction decreases due to latent heat. Due to less force of attraction, interparticle space between particles of air increases expanding the air. This even makes hot air less denser than cold air.
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air particles move away from each other and take up more space. That's why we say that air expand through which the volume of air increases.
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