Question

Compressibility factor, Z, of a gas is given as $Z=\frac{pV}{nRT}$.
(i) What is the value of Z for an ideal gas ?
(ii) For real gas what will be the effect on value of Z above Boyle’s temperature ?

Answer 1

The compression factor is the ratio of the molar gas volume to the ideal gas volume. It is the measurement of the amount of gas deviates at similar pressure and temperature from its perfect behaviour.

It is an important thermodynamic property used to change the law of ideal gas to take the behaviour of real gas into account. When the gas is closer to the change in phase, the difference between the gas and its ideal behaviour becomes more important.

(i) Z = 1 for ideal gases  

(ii) For real Gas, Z > 1 above Boyle's temperature.