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Atmospheric PressureAtmospheric pressure is the pressure due to air molecules colliding with the surfaces of bodies.
At sea level, atmospheric pressure is 1 atm or 1.013 * 10^5 Pa. Air pressure at higher altitude is lower. Application: Drinking water with a straw 
Courtesy of SPM Physics
Explanation:
When we suck through a straw, we are decreasing the pressure in the straw. This causes a pressure difference to be set up between the straw and the atmosphere. As the atmospheric pressure is greater, it pushes on the surface of the liquid, forcing the liquid to rise up the straw into our mouth. The following video shows how the absence of atmospheric pressure prevent us from drinking the water in the container. |
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