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Why do the gases at low temperature and ...

Why do the gases at low temperature and high pressure show large deviations from ideal behaviour ?

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When temperature is low and pressure is high the intermolecular forces become appreciable thus the volume occupied by the molecular is not negligibly small as composed to volume of gas.
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Deviation From Ideal Behaviour

Deviation From Ideal Behaviour

Any gas shows maximum deviation from ideal gas behaviour at

For a gas deviation from ideal behaviour is maximum at :

For ideal gases, Z = 1 at all temperature and pressure.

Write the conditions in terms of temperature and pressure under which gases deviate from ideal behaviour.

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