substance	speed (m/s)
Gases
Air (0^oC)	331
Air (20^oC)	343
CO₂ (0^oC)	259
Oxygen (0^oC)	316
Helium (0^oC)	965
Liquids
Chloroform (20^oC)	1004
Ethanol (20^oC)	1162
Mercury (20^oC)	1450
Fresh Water (20^oC)	1482
Sea Water (20^oC)	1522
Solids
Copper	5010
Glass (pyrex)	5640
Lead	1960
Steel	5960