•    The Atmospheric air exerts a normal pressure upon all the surfaces with which it comes in contact, is called as atmospheric pressure.

•    The atmospheric pressure varies with the altitude and it can be measured by means of a barometer. It is also called as barometric pressure.

•    There are two types of barometers i.e. Mercury barometer and Aneroid barometer.

•    At sea level, under normal atmospheric condition at 15⁰C, the equivalent values of atmospheric
pressure are 10.1043 x 10⁴ N/m² or 10.33m of water or 76 cm of mercury.

1 atm = 10.3 of water

P = γ .h = 9.81 x 10.3

P = 101.104KN/m² or kP_a

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