Page 47 - Pressure 10 class

Atmospheric Pressure

Atmosphere; The thick layer of air covering entire earth’s surface

is called atmosphere.

Atmospheric Pressure: The force exerted by the weight of the

atmosphere per unit area on the earth’s surface is known as

atmospheric pressure. It is Maximum at sea level and Minimum

at top of mountain.

Units Of Atmospheric Pressure ; The SI unit of atmospheric

2
pressure is N/ m or Pascal(Pa).

Atmospheric Pressure is generally expressed in millimeter of

mercury column.

At sea level, 1 atm = 760 millimeter of mercury (mm of Hg)

5
= 1.013x 10 Pa.

Standard Atmospheric Pressure: The pressure exerted by

atmosphere at sea level is called standard atmospheric pressure.

It is equal to 760mmof Hg, taken as1 atmosphere(1 atm).

July 30, 2020 Taranath Baral/GC Shiba/Suraj Thapaliya 47