title: Birch's Law: Why Is It So Good?
abstract: 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.
authors.forename: D H
authors.initials: DH
authors.lastname: Chung