On a pressure — temperature P—T diagram, the line separating the two phases is known as the coexistence curve. The Clausius—Clapeyron relation gives the slope of the tangents to this curve. The Clausius—Clapeyron relation characterizes behavior of a closed system during a phase change , during which temperature and pressure are constant by definition. Therefore,  : Using the appropriate Maxwell relation gives  :
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Por lo general, para alimentos en polvo el contenido de humedad a una cierta actividad de agua, decrece a medida que aumenta la temperatura .
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Correlation of Vapor Pressure at Different Temperatures by Clausius Clapeyron Equation Calculator