Which law asserts that the pressure of a fixed amount of gas at constant volume is directly proportional to its temperature in kelvins?

The law that states the pressure of a fixed amount of gas at constant volume is directly proportional to its temperature in kelvins is Gay Lussac's Law. This principle can be understood through the relationship expressed in the formula P/T = k, where P represents pressure, T represents temperature in kelvins, and k is a constant.

This means that if the temperature of the gas increases while the volume remains unchanged, the pressure will also increase proportionately. Conversely, if the temperature decreases, the pressure will also drop. This relationship highlights the direct proportionality between pressure and temperature for a gas under constant volume conditions.

Knowing this, we can differentiate it from other gas laws. Boyle's Law, for instance, deals with the relationship between pressure and volume when temperature is held constant, while Charles's Law connects volume and temperature. Avogadro's Law focuses on the relationship between the volume of a gas and the amount of substance at a given temperature and pressure. Each of these laws applies to different scenarios involving gas behavior, showcasing the unique application of Gay Lussac's Law to the specific situation of temperature and pressure at constant volume.