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When warm air meets cold air it:




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  • 1 decade ago
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    It will rise above the cold air. Hot air balloons work this way (the old type, which really fly on hot air - not the helium filled blimps, although they work on the same basic principle of buoyancy).

    As gases warm up, their molecules move more quickly due to the thermal energy, and they exert more force on the things around them. If the gas is contained, its pressure increases, but since the air is not constrained, it just expands, which means it is less dense. Since it is less dense than the cold air, it has a positive buoyancy which causes it to rise, just the same as a cork rises in water because its density is lower.

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