![]() ![]() #Nist webook propane series#The Real gas article features more theoretical methods to compute compressibility factors. Propane (C 3H 8, R-290) is the third alkane in the saturated hydrocarbon (parafn) series starting with methane. Nitrogen X X Carbon dioxide X X Dodecane X X Methane X X Propane X X Ethane. For a gas that is a mixture of two or more pure gases (air or natural gas, for example), the gas composition must be known before compressibility can be calculated.Īlternatively, the compressibility factor for specific gases can be read from generalized compressibility charts that plot Z The NIST Chemistry WebBook 6, an internet resource, is also quite useful. Compressibility factor values are usually obtained by calculation from equations of state (EOS), such as the virial equation which take compound-specific empirical constants as input. In general, deviation from ideal behaviour becomes more significant the closer a gas is to a phase change, the lower the temperature or the larger the pressure. It is a useful thermodynamic property for modifying the ideal gas law to account for the real gas behaviour. ![]() It is simply defined as the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure. In thermodynamics, the compressibility factor ( Z), also known as the compression factor or the gas deviation factor, describes the deviation of a real gas from ideal gas behaviour. ![]()
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