The suction gauge reading is measured in which unit?

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Prepare for the AAA EQC-152 Test. Leverage flashcards and multiple-choice questions, with each question offering hints and explanations. Enhance your readiness for the exam!

Multiple Choice

The suction gauge reading is measured in which unit?

Explanation:
A suction gauge is a vacuum gauge, and vacuum readings are traditionally expressed in inches of mercury. This unit comes from the historic use of a mercury column to measure pressure—describing how tall a column of mercury the pressure could support. In HVAC and refrigeration practice, using inches of mercury (inHg) provides an intuitive, widely adopted scale for how strong a vacuum is. Other units like psi, kPa, or bar measure pressure in different scales and are not the standard readout for suction gauges, which is why inHg is the correct choice.

A suction gauge is a vacuum gauge, and vacuum readings are traditionally expressed in inches of mercury. This unit comes from the historic use of a mercury column to measure pressure—describing how tall a column of mercury the pressure could support. In HVAC and refrigeration practice, using inches of mercury (inHg) provides an intuitive, widely adopted scale for how strong a vacuum is. Other units like psi, kPa, or bar measure pressure in different scales and are not the standard readout for suction gauges, which is why inHg is the correct choice.

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