What variable is not included in the Ideal Gas Law equation?

The Ideal Gas Law is represented by the equation PV = nRT, where P stands for pressure, V signifies volume, n represents the number of moles of gas, R is the ideal gas constant, and T denotes temperature. In this equation, pressure, volume, and temperature are all crucial variables that directly relate to the behavior of an ideal gas.

Density, while it can be derived from the Ideal Gas Law by rearranging the equation, is not explicitly included in the law itself. Density is defined as mass per unit volume and can be related to the other variables, but it does not play a direct role in the ideal behavior defined by the equation. Therefore, density is the variable that is not included in the Ideal Gas Law but can be calculated from it when needed.