Standard Atmospheric Pressure
the average atmospheric pressure at sea level, which is also known as normal pressure; the standard pressure is 29.92 in or 760.0 mm of mercury (1,013.25 millibar)
Atmospheric pressure can be expressed in terms of the height of such a column of mercury. Public weather reports give the pressure by referring
to such a mercury column, for example,
“The pressure is 30 inches (about 76 cm) and rising.”
If the atmospheric pressure at sea level is measured many times over long periods of time, an average value of 76.00 cm (29.92 in) of mercury is obtained.
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