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The following 2 entries include the term Clapeyron.
Clapeyron equation
noun: an equation relating to change of phase in a pure substance (as vaporization of a liquid) that gives the rate of change with temperature of the pressure at equilibrium between the phases in terms of the heat of transition and the volumes of the phases before and after the transition compare clausius-clapeyron equation
Clausius-Clapeyron equation
noun: the Clapeyron equation as modified for liquid-vapor phases by assuming that the vapor is an ideal gas and that the volume of the liquid phase is negligible in comparison with the volume of the vapor
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Merriam-Webster unabridged
