At what pressure is the vapor pressure measured at 68°F?

In the context of refrigeration, vapor pressure is the pressure at which a liquid's vapor is in equilibrium with its non-vapor phases. It is typically measured at specific temperature points, one of which is 68°F. The correct choice reflects the vapor pressure of refrigerants or substances at that temperature, which is often significant for understanding the behavior of refrigerants in industrial systems.

At 68°F, different refrigerants will have varying vapor pressures, and the choice that corresponds to 110 PSIG represents a specific refrigerant's behavior under those conditions. This value is critical for operators to know as it directly affects the calculations involving system pressures, efficiency, and safety protocols.

This understanding assists operators in determining safe operating levels, comparing pressures across different stages, and ensuring that equipment is functioning within designed limits. Knowing the accurate vapor pressure at various temperatures helps in diagnosing issues and maintaining optimal performance in refrigeration systems.