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The refrigerant pressure inside an R-12 unit, which is at room temperature (72 degrees F) and not operating, is:

A. approximately 74 psig
B. approximately 154 psig
C. approximately 214 psig
D. approximately 304 psig

Answer :

Final answer:

The refrigerant pressure inside an R-12 unit at room temperature (72 degrees F) when not operating is approximately 74 psig, based on the Pressure-Temperature (P-T) chart relationship for R-12.

Explanation:

The refrigerant pressure inside an R-12 unit which is at room temperature (72 degrees F) and not operating is: approximately 74 psig. This is because for most refrigerants, including R-12, the pressure inside the system at a given temperature is determined by its saturation pressure-temperature relationship, also known as the Pressure-Temperature (P-T) chart. At or around room temperature (which in this case is close to 72 degrees F), R-12 has a saturation pressure of approximately 74 psig.

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