Which variables are held constant when using Boyle's Law?

Boyle's Law states that for a given mass of gas at constant temperature, the pressure of the gas is inversely proportional to its volume. This means that when the volume of the gas increases, the pressure decreases, provided the temperature remains constant. In the context of the question, the correct answer indicates that temperature and the amount of gas are the variables held constant while observing the relationship between pressure and volume.

By holding the temperature constant, one ensures that the motion of the gas molecules remains unchanged by heat energy fluctuations, allowing for a direct comparison of pressure and volume. Similarly, keeping the amount of gas constant ensures that the number of molecules does not influence the results, isolating the relationship between pressure and volume alone.

When using Boyle's Law, it is essential to focus on how pressure and volume interact without the interference of temperature or quantity of gas, as those would introduce additional variables that could alter the outcome of the relationship being studied.