All for 20 oC, 1 Atm, audible frequencies. Extrapolated from tables in the reference below. Consult that reference for other conditions.
| Gas | Speed of Sound (m/s) |
|---|---|
| Argon | 319 |
| Helium | 1007 |
| Krypton | 221 |
| Xenon | 178 |
| Hydrogen | 1270 |
| Nitrogen | 349 |
| Oxygen | 326 |
| Carbon Dioxide | 267 |
| Sulfur Dioxide | 201 |
| Ethylene | 327 |
| Methane | 446 |
| Propane | 258 |
Reference: "Handbook of the Speed of Sound in Real Gases," by A. J. Zuckerwar (Academic Press, 2002).
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