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The Speed of Sound The first analytical determination of the speed of sound was given by Isaac Newton in Proposition 49 of Book II of the Principia. For sea level air at a typical ambient temperature he computed a value of 968 ft/sec (increased to 979 ft/sec in the 2nd edition), which is too low by about 13%, the true value being about 1116 ft/sec. To account for this difference, Newton ...
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