Speed of sound in helium at 25 degrees celsius

Q: What is the speed of sound in 25 degrees Celsius?

T25 is 298.15 K (= 25 °C = 77 °F), giving a value of 346.1 m/s (= 1135.6 ft/s = 1246 km/h = 774.3 mph = 672.8 kn).

The speed of sound (acoustic velocity) depends on the density and the bulk modulus elasticity of a gas.

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What is the speed of sound in 25 degrees Celsius?
What is the speed of sound in helium?
What is the speed of sound in hydrogen at 25 C?
What is the speed of sound in helium gas at 27 degree Celsius?

Here is a list of speeds of sound for some gases at atmospheric pressure.

You can also calculate the speed of sound here based on the gas properties of your application.

Gasft/sm/sAcetaldehyde912 ft/s278 m/sAcetylene1079 ft/s329 m/sAir1086 ft/s331 m/sAir, 20ºC1125 ft/s343 m/sAmmonia (30ºC)1443 ft/s440 m/sArgon (27ºC)1059 ft/s323 m/sBenzene (90ºC)656 ft/s200 m/sBromine (58ºC)489 ft/s149 m/sCarbon dioxide (0ºC)846 ft/s258 m/sCarbon dioxide (51ºC)918 ft/s280 m/sCarbon disulfide (35ºC)676 ft/s206 m/sCarbon monoxide (0ºC)1105 ft/s337 m/sCarbon tetrachloride (22ºC)436 ft/s133 m/sChlorine (0ºC)672 ft/s205 m/sChlorodifluoromethane R22 (17ºC)587 ft/s179 m/sChloroform (22ºC)505 ft/s154 m/sCyclohexan (30ºC)594 ft/s181 m/sDeuterium (0ºC)2913 ft/s888 m/sDichlorodifluoromethane R12 (17ºC)459 ft/s140 m/sDiethyl ether (40ºC)613 ft/s187 m/sEthane (31ºC)1036 ft/s316 m/sEthylene (20ºC)1073 ft/s327 m/sFluorine (102ºC)1089 ft/s332 m/sHelium (0ºC)3191 ft/s973 m/sHydrogen (27ºC)4330 ft/s1320 m/sHydrogen bromide (0ºC)656 ft/s200 m/sHydrogen chloride (0ºC)964 ft/s294 m/sHydrogen iodide (0ºC)515 ft/s157 m/sHydrogen sulfide (0ºC)968 ft/s295 m/sHydrogen sulfide (24ºC)1014 ft/s309 m/sKrypton (30ºC)735 ft/s224 m/sMethane (27ºC)1476 ft/s450 m/sMethane (41ºC)1528 ft/s466 m/sNeon (0ºC)1420 ft/s433 m/sNeon (30ºC)1512 ft/s461 m/sNitric oxide (16ºC)1096 ft/s334 m/sNitrogen (29ºC)1162 ft/s354.4 m/sNitrous oxide (0ºC)840 ft/s256 m/sNitrous oxide (25ºC)879 ft/s268 m/sOxygen (27ºC)1082 ft/s330 m/sOxygen (30ºC)1090 ft/s332.2 m/sSulfur dioxide (0ºC)686 ft/s209 m/sSulfur hexafluoride (11ºC)436 ft/s133 m/s1,1,2-trichloro-1,2,2-trifluoroethane R113 (53ºC)407 ft/s124 m/sTrichlorofluoromethane R11 (18ºC)469 ft/s143 m/sWater vapor steam (100ºC)1566 ft/s477.5 m/sWater vapour steam 6 MPa (350ºC)1873 ft/s571 m/s

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Acetaldehyde278Acetylene329Air331Air, 20oC343Ammonia (30oC)440Argon (27oC)323Benzene (90oC)200Bromine (58oC)149Carbon dioxide (51oC)280Carbon dioxide (0oC)258Carbon disulfide (35oC)206Carbon monoxide (0oC)337Carbon tetrachloride (22oC)133Chlorine (0oC)205Chloroform (22oC)154Cyclohexan (30oC)181Deuterium (0oC)888Diethyl ether (40oC)187Ethane (31oC)316Ethylene (20oC)327Fluorine (102oC)332Trichlorofluoromethane R11 (18oC)1431,1,2-trichloro-1,2,2-trifluoroethane R113 (53oC)124Dichlorodifluoromethane R12 (17oC)140Chlorodifluoromethane R22 (17oC)179Helium (0oC)973Hydrogen (27oC)1320Hydrogen bromide (0oC)200Hydrogen chloride (0oC)294Hydrogen iodide (0oC)157Hydrogen sulfide (24oC)309Hydrogen sulfide (0oC)295Krypton (30oC)224Methane (41oC)466Methane (27oC)450Neon (30oC)461Neon (0oC)433Nitric oxide (16oC)334Nitrogen (29oC)354.4Nitrous oxide (25oC)268Nitrous oxide (0oC)256Oxygen (27oC)330Oxygen (30oC)332.2Sulfur dioxide (0oC)209Sulfur hexafluoride (11oC)133Water vapor steam (100oC)477.5Water vapour steam 6 MPa (350oC)571

All for 20 oC, 1 Atm, audible frequencies. Extrapolated from tables in the reference below. Consult that reference for other conditions.

GasSpeed of Sound (m/s)Argon319Helium1007Krypton221Xenon178Hydrogen1270Nitrogen349Oxygen326Carbon Dioxide267Sulfur Dioxide201Ethylene327Methane446Propane258

Reference: "Handbook of the Speed of Sound in Real Gases," by A. J. Zuckerwar (Academic Press, 2002).

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This calculation is usually accurate enough for dry air, but for great precision one must examine the more general relationship for sound speed in gases. If you measured sound speed in your oven, you would find that this relationship doesn't fit. At 200°C this relationship gives 453 m/s while the more accurate formula gives 436 m/s. This sound speed does not apply to gases other than air, for example the helium from a balloon.

It is important to note that the sound speed in air is determined by the air itself. It is not dependent upon the sound amplitude, frequency or wavelength.

Calculation note: You may enter temperature to calculate sound speed, or enter sound speed to calculate the corresponding temperature.