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One of you (thanks, Kyle) suggested trying the experiment with another
gas. Well, homebrewer that I am, I went down to the kitchen and took the
CO2 cylinder, and "poured" CO2 into a vertical tube with the bottom
sealed. I got a 10% change in speed, and I estimate the measurement
uncertainty to be only a few percent. Now, the speed of sound in CO2 is
actually about 30 or 40% faster than in air, but I'm sure I didn't have
the tube full of just CO2. All I did was pour.