Certified Hyperbaric Technologist Practice Test

What does Charles' Law describe?

1. Temperature-pressure relationship

2. Temperature-volume relationship

3. Volume-pressure relationship

4. Pressure-density relationship

The correct answer is: Temperature-volume relationship

Charles' Law describes the relationship between the temperature and volume of a gas when the pressure is held constant. Specifically, it states that when the temperature of a gas increases, its volume also increases, provided the pressure does not change. This is due to the fact that gas particles move more rapidly as the temperature rises, causing them to occupy more space. The law is often expressed mathematically as V1/T1 = V2/T2, where V represents volume and T represents temperature in Kelvin. This relationship is fundamental in understanding how gases behave under changing temperature conditions and is particularly relevant in fields such as physics and engineering, as well as in medical applications like hyperbaric oxygen therapy. Other options do not accurately reflect the primary focus of Charles' Law; thus, they do not adequately capture the essence of the temperature-volume interplay that the law highlights.