You know that there is air all around us. This envelop of air is known as the
atmosphere. The atmospheric air extends up to many kilometres above the surface of
the earth. The pressure exerted by this air is known as atmospheric pressure. We know
that pressure is normal force per unit area. If we imagine a unit area and a very long
cylinder standing on it filled with air, then the force of gravity on the air in this cylinder
is the atmospheric pressure
Answers
Explanation:
That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
The atmosphere is the thin envelope of gas molecules surrounding the Earth; it is held down by Earth's gravitational pull. The atmosphere is concentrated at the Earth's surface and rapidly thins as you move upward, blending with space at about 100 miles above sea level.
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.
An atmosphere is the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases.