![]() Other commonly used units for specific volume are liter per kilogram or cubicĭecimeter per kilogram which are equal to 0.001 m 3/kg.ĭensity and specific volume of liquids are changing with the change of temperature, and if high pressures are being considered,ĭensity and specific volume will change as well. Specific volume is the volume of substance per unit of mass, and is reciprocal to density. Where is: p c - critical pressure T c - critical temperature. Where is: p r - reduced pressure T r - reduced temperature Z - compressibility factor. ![]() Compressibility factor can be calculated using Berthelot equation: Where is: p - pressure ρ - density T - absolute temperature Z - compressibility factor Ĭompressibility factor is function of pressure and temperature. Where is: p - pressure ρ - density R - gas constant T - absolute temperature.įor real gas modified equation of state is used with compressibility factor included: įor perfect gas relation between pressure, density and temperature is expressed using the equation of state: Also, other units are used for density like gram per cubic centimeter, or gram per milliliter which are both equal to 1000 kilograms per cubic meter. The unit of density is kilogram per cubic meter in SI system of units and used symbol is ρ. Where is: ρ - density m - mass V - volume. The density is the mass of substance per unit of volume. Gas pressure, temperature and density relation Density of liquid and gas, compressibility factor.
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