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Originally Posted by kilimanjaro
Denser air will slow the bullet and cause greater drop
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It's counterintuitive, but AFAIK humid air is
less dense than dry air: A molecule of water will displace a molecule of air, and the molecular mass of water is much less than the average molecular mass of air; ergo the mass of a given volume of humid air (i.e. density) is less than the same volume of dry air.