Discussion
Consider the following statements about the compressibility factor.
1. It equals one for an ideal gas at all conditions.
2. It falls below one at moderate pressures for most gases.
3. It can never exceed one for any real gas.
Answer: D
The first two are correct. The third is wrong, because at high pressure the molecules are pushed close enough that repulsive forces dominate and the factor climbs above one, sometimes well above. Hydrogen and helium show this at quite ordinary pressures.
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