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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