Ideal Gas Law
PV = mRT
Pressure times volume is equal to the mass of the gas times the gas constant times the temperature. This relation holds for superheated gasses, that is, gasses that are at a significantly greater temperature than their saturation temperature. As the temperature approaches t-saturation, the behavior of the gas will increasingly diverge from this relationship. For substances that undergo phase transitions, therefore, one must use property tables to determine the thermodynamic parameters of the substance. [tbf]
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