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        how do we express compressibility factor in terms of critical pressure and critical temperature.

6 years ago

419 Points
										Dear Student
$Z=\frac{p \tilde{V}}{R T}$
where, p is the pressure, $\tilde{V}$ is the molar volume of the gas, T is the temperature, and R is the gas constant.
For an ideal gas the compressibility factor is Z = 1 per definition
The reduced temperature and pressure are defined as:
$T_r = \frac{T}{T_c}$ and $P_r = \frac{P}{P_c}$
Tc and Pc are known as the critical temperature and critical pressure of  a gas. They are characteristics of each specific gas with Tc being the  temperature above which it is not possible to liquify a given gas and Pc  is the minimum pressure required to liquify a given gas at its critical  temperature.
$T_r = \frac{T}{T_c + 8}$ and $P_r = \frac{P}{P_c + 8}$

now you can eliminate T and P and put in terms of critical temp and pressure.

All the best.
AKASH GOYAL

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6 years ago
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