What is the expected pressure of a storage cylinder of recovered R500 at normal room temperature?

When considering the expected pressure of a storage cylinder containing recovered R500 at normal room temperature, it's important to understand the properties of refrigerants and how they behave under varying temperatures. R500, which is a mixture of refrigerants, typically has specific pressure-temperature relationships that dictate what pressure to expect at a given temperature.

At room temperature, which is commonly around 70°F (21°C), the pressure of R500 tends to be around 93.5 psig. This value is derived from refrigerant pressure-temperature charts that show the correlation between the temperature and the vapor pressure of the refrigerant. At this temperature, R500 would exist in a saturated state, meaning that the vapor pressure corresponds to the pressure of the gas in the storage cylinder.

The other choices represent pressures that deviate from the expected value for R500 at normal room temperature. Lower pressures would not correspond to the saturation levels of R500, while higher pressures exceed what is typical for the refrigerant at room temperature. Thus, 93.5 psig is the accurate expectation for the pressure of R500 in a storage cylinder under these conditions.