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First Edition Preface Second Edition Preface Acknowledgments
density—1. The ratio of the mass of any substance to the volume occupied by it (usually expressed in kilograms per cubic meter, but any other unit system may be used); the reciprocal of specific volume. In a continuous medium the density is defined by a limiting process and is a point function. 2. The ratio of any quantity to the volume or area it occupies; for example, flux density, power density, ion density, electron density, drainage density.