And if you want to get even more complicated, relative air pressure also affects the speed of sound -- heat (high pressure) makes the speed of sound higher, and cold (low pressure) makes it lower. Wind also affects the speed of sound, for the same reason.
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War is the absence of reason. But then, life often demands unreasonable responses. - Lucian Soulban, Warhammer 40000 series, Necromunda Book 6, Fleshworks
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