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The compressibility factor (Z), is the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure.
Deviation of real gas from ideal behaviour is expressed in terms of compressability factor (Z) mathematically expressed as Pv/nRT.
For ideal gases, Z = 1, PV = nRT.
For real gases, Z >1, PV > nRT, it refers to positive deviation i.e. the gas is less compressable than expected from ideal behaviour.
Z
The value of Z will be greater than 1(Z>1), shows positive deviation above Boyle’s temperature.
Compressibility factor is significant because it determines how far a gas is from it's ideal state, based on various factors. The compressibility factor is determined by the pressure, volume, temperature and number of moles in the gas.
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Arun (askIITians forum expert)
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