Question

Gloup-A

a) The value of normal atmospheric pressure is --- m of water.​

Answer 1

${\huge{\star{\underbrace{\tt{\red{Answer}}}}}}{\huge{\star}}$

${\sf{\large{\blue{Atmospheric \ pressure}}}}$

The atmospheric air exerts a force on all the objects in the atmosphere and on the earth. The force or thrust exerted by the atmospheric air on a unit area is defined as atmospheric pressure.

The approximate value of atmospheric pressure on the earth's surface is 1.013 x 105 Pa.

${\sf{\orange{ Why \ it \ is \ caused \ ?}}}$

Atmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface and is a function of the mass of the planet, the radius of the surface, and the amount and composition of the gases and their vertical distribution in the atmosphere. It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature and variations in composition.

${\sf{\green{ Its \ value }}}$

Standard air pressure at sea level is 1 atmosphere, or 1 atm. This is the standard value, but it will not always equal this value due to changes in weather.

1 atm = 760 mm of Hg or 76 cm of Mercury.

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