Pressure of air enveloping the earth, averaged as 14.7 psi at sea level, or 29.92 inches of mercury as measured by a standard barometer.
(air; enveloping; the earth) (Pressure of air; averaged; as 14.7 psi at sea level, or 29.92 inches of mercury)
air Pressure of air
enveloping averaged
the earth
as 14.7 psi at sea level, or 29.92 inches of mercury