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Question

What is the average value of barometric atmospheric pressure at sea level?

A
76cm of Hg
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B
76cm of water
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C
76cm of air
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D
24cm of Hg
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Solution

The correct option is A 76cm of Hg
Atmospheric pressure is the pressure exerted by the earth's atmosphere at any given point, being the product of the mass of the atmospheric column of the unit area above the given point and of the gravitational acceleration at the given point.
It has a value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury 29.92 inches(760mm) high, or 1013 millibars(101.3kPa).
At sea level the atmospheric pressure is approximately 1kg/cm2 (14.7 pounds per square inch), which will cause a column of mercury in a mercury barometer to rise 760mm.

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