The zero psi reading on most pressure gauges is equivalent to which pressure at sea level?

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Prepare for the Apparatus Operator/Pumper Test. Utilize flashcards and multiple-choice queries, complete with hints and explanations. Ensure success on your exam!

Multiple Choice

The zero psi reading on most pressure gauges is equivalent to which pressure at sea level?

Explanation:
Gauges read pressure relative to the surrounding air. When a gauge shows zero, there’s no pressure above the ambient atmospheric pressure inside the system. To get the absolute pressure, you add the atmospheric pressure. At sea level, atmospheric pressure is about 14.7 psi. So a zero reading on the gauge corresponds to roughly 14.7 psi absolute pressure. (0 psi would imply a vacuum relative to ambient, while 7.5 psi or 21 psi do not match the standard atmospheric pressure at sea level.)

Gauges read pressure relative to the surrounding air. When a gauge shows zero, there’s no pressure above the ambient atmospheric pressure inside the system. To get the absolute pressure, you add the atmospheric pressure. At sea level, atmospheric pressure is about 14.7 psi. So a zero reading on the gauge corresponds to roughly 14.7 psi absolute pressure. (0 psi would imply a vacuum relative to ambient, while 7.5 psi or 21 psi do not match the standard atmospheric pressure at sea level.)

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