What is the normal air pressure at sea level?

The correct answer is 1013.25 millibars.

Important Points

• The normal air pressure at sea level is 1,013.2 millibars.
• The air at the surface is denser due to gravity, which hence has greater pressure.
• Air pressure is measured using a mercury barometer or aneroid barometer.
• The value of what we call standard sea-level pressure is 760mm of mercury, 1013.25 x103 dynes per square centimeter, 14.70 pounds per square inch, 1013.25 millibars, or simply one standard atmosphere which is 101.325 kilopascals.
• The air majorly contains 72 percent nitrogen and 21 percent oxygen, in addition to a small amount of carbon dioxide, hydrogen, etc.
• Air has weight and thus, like liquids, it exerts pressure.
• A force is exerted by the atmospheric air on all objects in the atmosphere and on the earth.
• The force or thrust exerted on a unit area by the atmospheric air is defined as atmospheric pressure.
• 1.013 x 105 Pa is the approximate value of atmospheric pressure on the earth's surface.
• The standard atmospheric pressure is 0.760 mHg at 0 °C.
• This is a pressure equal to 101325 Pa.