Certified Transport Registered Nurse Certification Practice Exam

Which gas law states that at constant temperature, pressure is inversely related to volume?

1. Dalton's Law

2. Boyle's Law

3. Charles's Law

4. Henry's Law

The correct answer is: Boyle's Law

Boyle's Law is the correct answer because it specifically addresses the relationship between pressure and volume of a gas at a constant temperature. According to Boyle's Law, when the temperature remains unchanged, an increase in the volume of a gas leads to a decrease in its pressure, and vice versa. This is mathematically represented as P1V1 = P2V2, where P is pressure, V is volume, and the subscripts indicate different states of the gas. In contrast, other gas laws do not convey this inverse relationship. Dalton's Law pertains to the total pressure exerted by a mixture of gases and how it is related to the partial pressures of the individual gases. Charles's Law describes how the volume of a gas is directly proportional to its temperature when pressure is held constant. Henry's Law, on the other hand, deals with the solubility of a gas in a liquid and its relationship to pressure but does not involve a direct inverse relationship between pressure and volume. Understanding Boyle's Law is essential for scenarios where gas behavior is influenced by changes in pressure and volume without temperature variation.