MmHg

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Category: General Information

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mmHgᵂ is "millimeters of Hg (Mercury)", a measure of vacuum. Originally defined as the extra pressure generated by a column of mercury one millimetre high, as read out by a Mercury pressure gauge.

ATMOSPHERIC PRESSURE nominal at sea level
760 mm Hg
29.9212 inches Hg
14.696 psi
1 bar

CONVERSIONᴳ TABLE
mmHg inHg (inches of mercury)
560  22.0
600  23.6
 10  0.39

NORMAL intake manifold vacuum
457-559 mm mercury
18-22   inches mercury

Vacuum gauge reading in Inches (inHg)
 

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