It is the pressure exerted by atmospheric air on any
surface. It is measured by a barometer. It’s standard Values are;
1 Patm = 760 mm of
Hg i.e. column or height of mercury
= 101.325 kN/m2 = 101.325 kPa
= 1.01325 bar
When the density of mercury is taken as 13.595 kg/m3
and acceleration due to gravity as 9.8066 m/s2
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