- The force, applied on a unit area of a surface is known as pressure Pressure=force/areaonwhichitactsPressure=force/areaonwhichitacts.
- If the area is smaller, then the pressure on a surface would be greater; e.g. this is the reason that the area of one end of a nail is pointed toexertsufficientpressuretoexertsufficientpressure and other end is bigger asshownintheimagegivenbelowasshownintheimagegivenbelow.
- This envelop of air is known as the atmosphere that extends up to many kilometers above the surface of the earth.
- The pressure exerted by the air is known as atmospheric pressure.
- The pressure inside our bodies is exactly equal to the atmospheric pressure and annuls the pressure acting from outside seetheimagegivenbelowseetheimagegivenbelow.
- Liquids and gases also exert pressure on the walls of their respective containers.
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