National League for Nursing (NLN PAX) Practice Exam

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According to the Ideal Gas Equation (PV = nRT), what happens to gas volume when pressure increases with constant temperature and amount of gas?

As pressure increases, volume decreases.
As pressure increases, volume increases.
The volume equalizes despite pressure changes.
The volume and pressure are unrelated.

The correct answer is: As pressure increases, volume decreases.

The correct answer is that as pressure increases, volume decreases. This relationship is a direct consequence of Boyle's Law, which states that for a given mass of gas at constant temperature, the volume of the gas is inversely proportional to the pressure exerted on it. This means that if the pressure on a gas is increased while keeping the temperature and quantity of gas constant, the volume must decrease to maintain the equality stated in the Ideal Gas Equation (PV = nRT). When pressure rises, the gas molecules are pushed closer together, leading to a smaller volume. Conversely, if the pressure were to decrease, the volume would increase, illustrating this inverse relationship. This principle is crucial in understanding how gases behave under different conditions and is applied in various scientific and engineering contexts.