Birch's Law: Why Is It So Good?

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Science  21 Jul 1972:
Vol. 177, Issue 4045, pp. 261-263
DOI: 10.1126/science.177.4045.261


Birch's law arises in the physics of solids as a linear approximation, in a certain range of density, of a power law. For a change of chemical composition within the same crystal structure, the velocity-density relation is constant with a slope of nearly -0.5 in the first-order approximation.

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