What physical property of a refrigerant is primarily affected by sensible heat?

Sensible heat is the heat exchanged by a substance that results in a change in temperature but not a change in phase. When heat is added or removed from a refrigerant, its temperature changes accordingly, directly reflecting the impact of sensible heat.

As the temperature of the refrigerant increases, the kinetic energy of its molecules also increases, causing them to move more rapidly. This change in energy and motion is what we observe as a change in temperature. Therefore, the correct answer highlights the direct relationship between sensible heat and temperature, making it essential in understanding how refrigerants behave in thermal systems.

In contrast, pressure, density, and viscosity are influenced by various other factors in addition to temperature, such as phase changes and specific system conditions. While they may change when temperature changes, the primary and direct effect of sensible heat is most notably observed through the temperature of the refrigerant. Understanding this concept is crucial for the effective utilization and management of refrigerants in industrial applications.