vapor pressure The pressure exerted by a vapor in equilibrium with its liquid or solid. In an enclosed space this occurs when equal numbers of molecules are entering and leaving the vapor, which is then saturated. For a pure substance, the saturated vapor pressure (SVP) depends on the temperature. The boiling point of a liquid is reached when the SVP equals the external pressure. Related category PHYSICAL CHEMISTRY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |