What describes the relationship between pressure and temperature in refrigeration?

The relationship between pressure and temperature in refrigeration is governed by fundamental principles of thermodynamics, particularly in the context of refrigerants. When considering a refrigerant in a closed system, it is critical to understand that as the pressure of a gas increases, its temperature also increases. This is due to the fact that when a substance is compressed (increased pressure), the molecules are forced closer together, resulting in increased kinetic energy of the molecules, which raises the temperature.

Conversely, if the pressure decreases, the temperature will also decrease, assuming no heat is added or removed from the system. This relationship is often depicted in pressure-temperature charts specific to refrigerants, illustrating that at constant volume, an increase in pressure results in a proportional increase in temperature.

Thus, the correct statement reflects this direct relationship where increased pressure leads to increased temperature and vice versa. Understanding this principle is essential for HVAC technicians when servicing systems, as it helps in diagnosing issues and ensuring the proper operation of refrigeration and air conditioning equipment.