Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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vapor pressure

The pressure which exists over every liquid (or solid). In a closed vessel, given sufficient time, equilibrium is attained, in which as many molecules leave the liquid surface to form vapor as return to it from the vapor phase to form liquid. The pressure of vapor above any liquid or solid at any temperature, when equilibrium exists, is called the vapor pressure of the liquid or solid at that temperature. (235 )




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