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Technician A says engine vacuum is normally measured in inches of mercury (in. Hg).

Technician B says a pressure gauge that is labeled psig will read 14.7 psi at sea level.

Who is correct?

Answer :

Both Technician A and Technician B are correct in their statements.

Technician A is correct in stating that engine vacuum is typically measured in inches of mercury (in. Hg).

Engine vacuum refers to the difference in pressure between the inside and outside of the engine. It is commonly measured using a vacuum gauge, and the unit of measurement is inches of mercury.

The vacuum gauge displays the amount of vacuum present in the engine by measuring how far the pressure deviates below atmospheric pressure, which is typically expressed in inches of mercury.

Technician B is also correct in stating that a pressure gauge labeled psig (pounds per square inch gauge) will read 14.7 psi (pounds per square inch) at sea level.

The abbreviation "psig" indicates that the pressure is measured relative to atmospheric pressure. At sea level, atmospheric pressure is approximately 14.7 psi.

Therefore, a pressure gauge labeled psig will read 14.7 psi when the pressure being measured is equal to atmospheric pressure.

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