Text: Velocity = Frequency X Wave Length Velocity of sound in air varies greatly with temperature. The velocity at any temperature can be found adding 1 foot for a degree of Fahrenheit. Air = Unity or 1083 ft per second @ sea level Water 4 x air Hydrogen 4 x oxygen Oxygen .25 x hydrogen Air .25 x water Carbonic gas .8 x air Coal gas 1.6 x air Hydrogen 3.56 x air Brass 10.86 x air or 11480 fps Steel 15.34 x air or 16410 fps or 197,016 inches per second Glass 15.25 x air Copper 11.96 x air or 11.17 or 11.96 or 11670 fps Steel wire 15.108 or 15.34 FT/SEC Silver 8553 Gold 5717 Platinum 8815 Aluminum 16,740 fps Lead 4030 (68) Silver 8553 (68) Copper 11666 (68) Iron 16822 (68) Steel 16357 (68) Wood (along fiber) 10,000 to 15,000 (68) Wood (across fiber) 3,000 to 5,000 Air 32° F. 1090 Water @ 8° C. 4708 Brick 11980 Cork 1640 Water 4794 Air, dry CO2 free, 32°F 1088.5 Hydrogen 4165 Water vapor 212°F 1328

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