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Science 21 July 1972:
Vol. 177. no. 4045, pp. 261 - 263
DOI: 10.1126/science.177.4045.261
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Articles

Birch's Law: Why Is It So Good?

Dae H. Chung 1

1 Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139

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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Science. ISSN 0036-8075 (print), 1095-9203 (online)