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Whoa that's something I didn't realize. I always had the intuition the speed was faster in denser materials but you're right that pressure doesn't matter.

The temperature difference does make sense for the same reasons here though!




It does depend on density because density, pressure, and temp are all related. https://en.m.wikipedia.org/wiki/Ideal_gas_law


For an ideal gas. Get close to the triple point of the gas and you better upgrade your equation of state




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