Which equation relates pressure and volume at constant temperature?

The equation that relates pressure and volume at constant temperature is derived from Boyle's Law, which states that for a given mass of gas at a constant temperature, the pressure of the gas is inversely proportional to its volume. This is mathematically expressed as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume after a change, while temperature remains constant.

This relationship highlights that if the volume of a gas decreases, the pressure will increase, and vice versa, as long as the temperature is unchanged. This fundamental principle is crucial for understanding gas behavior in various chemical and physical processes.

The other choices don't accurately represent this relationship; for example, some incorporate temperature in a way that is not aligned with the principles of Boyle's Law or involve incorrect combinations of the variables.