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Answer :
Final answer:
The correct answer is option b. 87 psig. R-134a is a refrigerant that is widely used in automobile air conditioning systems and refrigeration applications.
Explanation:
The approximate pressure of a storage cylinder of recovered R-134a at 80°F, assuming no non-condensable impurities, is about 87 psig, as determined by the saturation pressure on the pressure-temperature chart for this refrigerant.
When dealing with refrigerants, it is crucial to consult the pressure-temperature (PT) chart specific to the refrigerant. The PT chart provides the relationship between the temperature and the corresponding saturation pressure. For R-134a at 80°F (approximately 26.7°C), the saturation pressure is roughly 87 psig. Remember, 'saturation pressure' is the pressure at which the refrigerant will begin to change phases at a given temperature. This case assumes that there are no non-condensable impurities in the cylinder, which could otherwise affect the pressure.
It's important to note that 'psig' refers to 'pounds per square inch gauge,' which considers the atmospheric pressure as a baseline, whereas 'psia' ('pounds per square inch absolute') measures pressure including the atmospheric pressure.
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