Real gas

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Real gases — as opposed to a perfect or ideal gas — exhibit properties that cannot be explained entirely using the ideal gas law. To understand the behaviour of real gases, the following must be taken into account:

For most applications, such a detailed analysis is unnecessary, and the ideal gas approximation can be used with reasonable accuracy. On the other hand, real-gas models have to be used near the condensation point of gases, near critical point, at very high pressures, and in other less usual cases.


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van der Waals model

Real gases are often modeled by taking into account their molar weight and molar volume


Where P is the pressure, T is the temperature, R the ideal gas constant, and V<sub>m</sub> the molar volume. a and b are parameters that are determined empirically for each gas, but are sometimes estimated from their critical temperature (T<sub>c</sub>) and critical pressure (P<sub>c</sub>) using these...
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