Newtonian Speed of Sound

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Newtonian Speed of Sound

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An approximation to the speed of sound a in a perfect gas

given by the relation a² = p / ρ where p is pressure and ρ is density. Compare Laplacian speed of sound. See acoustic velocity.

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Newton derived this expression by assuming the propagation of sound to be an isothermal process. It leads to values about 16 percent below those observed. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use