Answer :

Final answer:

C) 500 psig

The maximum reading on a typical R22 high pressure gauge is 500 psig. This measurement is a type of gauge pressure, not absolute pressure, and can vary based on factors like altitude and environmental temperature.

Explanation:

The typical R22 high-pressure gauge can read a maximum pressure of 500 psig. Remember that a pressure gauge measures the difference between system pressure and atmospheric pressure. This is often referred to as gauge pressure. It's important to note that the gauge does not measure absolute pressure which includes the atmospheric pressure in its reading. Absolute pressure can be calculated by adding the gauge pressure to the prevailing atmospheric pressure. Additionally, the reading on your pressure gauge can be influenced by changes in altitude and environmental temperature which can affect the density and behavior of the gas inside the system.

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