Vapor pressure is the pressure in equilibrium with non-vapor phases. All liquids and solids have a tendency to get evaporated to gaseous form, and all gases have a tendency to get condensed back into their original form. At any particular temperature, for a substance, there is a pressure at which the gas of that substance is in dynamic equilibrium with its liquid or solid forms and this is the vapor pressure of that substance at that temperature. The equilibrium vapor pressure is basically an indication of evaporation rate. It does relates to the tendency of atoms and molecules to escape from a liquid or a solid. A substance with a high vapor pressure at normal temperatures is often known as volatile.
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