Which law states that pressure remains constant while temperature and volume rise and fall together?

The correct answer is Charles' Law, which describes the relationship between the temperature and volume of a gas at constant pressure. According to Charles' Law, when the temperature of a gas increases, its volume also increases, provided that the pressure remains constant. Conversely, if the temperature decreases, the volume will also decrease. This relationship is crucial for understanding how gases behave when subjected to temperature changes, which is relevant in various applications, including air conditioning and refrigeration systems.

This law is a result of the kinetic molecular theory, which states that as temperature increases, gas particles move faster, causing them to spread out more and occupy a larger volume. The constancy of pressure in this law allows for a direct comparison of how temperature and volume change together as one adjusts the other.

Understanding Charles' Law is essential in the context of HVAC systems, where temperature management is critical for efficient operation.