Ideal Gas Correction Factor

Quantifies the deviation of an actual gas from an ideal gas:

$$Z=\frac{P{v}_{\text{actual}}}{RT}=\frac{v_{\text{actual}}}{v_{\text{ideal}}}$$

• For an ideal gas, $Z=1$ and $v_{\text{actual}}=v_{\text{ideal}}$.
• Molecular attraction makes it easier to compress a gas, such that $Z<1$ and $v_{\text{actual}}<v_{\text{ideal}}$.
• Molecular repulsion makes it harder to compress a gas, such that $Z>1$ and $v_{\text{actual}}>v_{\text{ideal}}$.