Final Conceptual Check.
I. A gas behaves more ideally at low pressure and high temperature.
II. At T = 0 K, the pressure of an ideal gas would be zero.
III. The compressibility factor Z = PV/nRT is 1 for an ideal gas.
IV. For a real gas, Z < 1 indicates that attractive forces are dominant (gas is easier to compress).
V. For a real gas, Z > 1 indicates that repulsive forces (size effects) are dominant (gas is harder to compress).
