Ernest G. Ehlers | Britannica

Ernest G. Ehlers

Contributor

BIOGRAPHY

Emeritus Professor of Geology and Mineralogy, Ohio State University, Columbus. Author of The Interpretation of Geological Phase Diagrams and others.

Primary Contributions (1)

Diagram showing four physical states of matter: solid with tightly packed molecules, liquid with loosely packed molecules, gas with widely spaced molecules, and plasma with free electrons and nuclei, each labeled with descriptions and an arrow indicating increasing energy.

phase

Phase, in thermodynamics, chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or a mixture of substances. The three fundamental phases of matter are solid, liquid, and gas…

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