Which equation expresses the General Gas Law?

The General Gas Law describes the relationship between the pressure (P), density (ρ), temperature (T), and the specific gas constant (R) for an ideal gas. The equation ρ = P/RT derived from the ideal gas law is an effective representation of this relationship.

In this equation, density is obtained by dividing pressure by the product of the specific gas constant and temperature. This clearly illustrates how changes in pressure and temperature directly affect the density of a gas, providing a fundamental understanding of gas behavior under various conditions.

The correct expression is rooted in the understanding that for an ideal gas:

1. Pressure is directly proportional to density and temperature.

2. Rearranging the ideal gas law (PV = nRT) leads to expressions that can isolate density as a function of pressure and temperature.

Thus, the option that captures the direct mathematical representation of the General Gas Law, accurately showing how these variables interact, is the one selected.