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kinetic energy pound force pound mass pound mole mass mass rate of flow molecular weight number of moles polytropic exponent pressure partial pressure of component i in a mixture potential energy relative pressure as used in gas tables heat transfer per unit mass and total heat transfer rate of heat transfer heat transfer from high- and low-temperature bodies gas constant universal gas constant specific entropy and total entropy time temperature specific internal energy and total internal energy specific volume and total volume velocity relative velocity work per unit mass and total work rate of work, or power reversible work between two states assuming heat transfer with surroundings mass fraction elevation compressibility factor

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