Service Description


The volume of a real gas is usually less than what the volume of an ideal gas would be at the same temperature and pressure. The ratio of the real volume to the ideal volume, which is a measure of the amount that the gas deviates from perfect behavior, is called the compressibility factor. Compressibility factors are measured in a variable-volume PVT equilibrium cell. The gas deviation factor, z, is determined by measuring the volume of a sample of the natural gas at a specific pressure and temperature, then measuring the volume of the same quantity of gas at atmospheric pressure and at a temperature sufficiently high so that the hydrocarbon mixture is in the vapor phase.