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It's because colder air is much denser than hot air. The molecules in hot air are farther apart (expand - lighter), while the molecules in cold air are closer together (condense- heavier).

When air is heated, it expands because the gaseous particles gain kinetic energy. The formula density = mass/volume implies that the density of a substance is inversely proportional to its volume (provided that its mass is constant, which in turn means constant amount of that substance based on the number of moles). Therefore an increase in volume means a decrease in density.

Therefore, cold air has a higher density compared to hot air. This is why hot air balloons can rise up to the sky!

Any object that is heated becomes less dense and expands making a cc of it lighter, This is because the molecules that make it up become more exited and require more room as they are bumping into each other.

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13y ago

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