What is the approximate saturation temperature for R-134a at 30 psi?

To determine the saturation temperature for R-134a at a pressure of 30 psi, understanding the relationship between pressure and temperature in refrigerants is crucial. Refrigerants have specific saturation points where they change from liquid to vapor and vice versa, and these points are heavily documented.

For R-134a, at 30 psi, the saturation temperature can be cross-referenced from pressure-temperature charts or tables specific to the refrigerant. The saturation temperature corresponding to 30 psi falls around 20°F (-6.7°C). This value indicates the temperature at which R-134a will coexist as both liquid and vapor at that pressure.

Using this understanding, the specific thermodynamic properties of R-134a confirm that at lower pressures, the saturation temperature will also decrease, aligning with the data available for this refrigerant. Thus, choosing the option that indicates about 20°F is consistent with established thermodynamic principles regarding R-134a's behavior under the specified pressure.