CBSE Class 8 Answered
what is atmospheric pressure??
Asked by shrivastavaomprakash47 | 16 Nov, 2018, 09:42: PM
Expert Answer
Atmospheric pressure is force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area).
Atmospheric pressure can be measured with a mercury barometer , which indicates the height of a column of mercury
that exactly balances the weight of the column of atmosphere over the barometer.
Atmospheric pressure is expressed in several different systems of units: millimetres of mercury, pounds per square inch (psi),
standard atmospheres, or kilopascals.
Standard sea-level atmospheric pressure, by definition, equals 760 mm (29.92 inches) of mercury,
14.70 pounds per square inch, one standard atmosphere, or 101.325 kilopascals.
Answered by Thiyagarajan K | 16 Nov, 2018, 10:09: PM
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