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Noun
1. steam pressure
Wikipedia definition
2. Vapor pressureVapor pressure or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's evaporation rate. It relates to the tendency of particles to escape from the liquid (or a solid). A substance with a high vapor pressure at normal temperatures is often referred to as volatile.
Read “Vapor pressure” on English Wikipedia
Read “蒸気圧” on Japanese Wikipedia
Read “Vapor pressure” on DBpedia

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