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?

Question

Quizplus · Accepted Answer

Technician A is correct because engine vacuum is indeed typically measured in inches of mercury (in. Hg). Technician B is incorrect because a gauge labeled psig (pounds per square inch gauge) measures pressure relative to atmospheric pressure and would read 0 psi at sea level, not 14.7 psi.

Technician a Says Engine Vacuum Is Normally Measured in Inches