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At a given temperature, lighter gas molecules leak through a tiny hole faster than heavier gas molecules do because the lighter molecules _____ than the heavier molecules.
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At a given temperature, lighter gas molecules leak through a tiny hole faster than heavier gas molecules do because the lighter molecules _____ than the heavier molecules.

User Jesse Van Der Pluijm
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"... lighter molecules are smaller than the heavier molecules."
User Aaron Gibralter
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At a given temperature, lighter gas molecules leak through a tiny hole faster than heavier gas molecules do because the lighter molecules are moving faster than the heavier molecules.
User Discodane
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