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Bipogram t1_j5kd2vd wrote

Only three qualities alter the speed of sound.

The mean molecular mass (ie, what the gas is made of) and temperature (and the ratio of specific heats, gamma). Pressure has no effect on speed of sound, but (of course) the density of a gas will dictate how much acoustic energy may be found.

Gravity influences the density profile of a gas, but that's all.

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