Dictionary:Birch’s law

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Empirical relations between density in g/cm3, P-wave velocity V in km/s, and mean atomic number m. For nonporous rocks,

where a(m)=137 for m=21. Alternatively:

or ,

where a, b are constants. Named for Albert F. Birch (1903-1992), American geophysicist.

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Birch’s law
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