Which of the following temperature and pressure combinations applies to R717 vapor density calculations?

When calculating vapor density for refrigerants such as R717 (ammonia), it is crucial to understand that this is influenced by both temperature and pressure. The specific combination of temperature and pressure must align with the established thermodynamic properties of R717 to derive accurate vapor density values.

In this context, the combination of 165.54 degrees and a corresponding density of 0.6007 lbs./ft³ is correct because it reflects the accurate thermodynamic data for R717 at that temperature and pressure. R717 has a lower density compared to some other refrigerants, and precise values are essential for calculations concerning system design, operational efficiency, and safety.

This specific combination ensures that you are working within the acceptable parameters for R717, facilitating accurate predictions and calculations regarding the behavior of the vapor phase in refrigeration applications. Using this accurate data helps prevent operational issues and enhances system reliability and performance.