Air pressure
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Air pressure is the scientific name for the pressure we experience every day due to the weight of the atmosphere. The typical air pressure at sea level is one atmosphere (1 atm, or 760 millimeters of mercury); as you climb higher, the air pressure decreases. For example, the air pressure on top of Mount Everest is less than the air pressure on top of Mount McKinley.
Air pressure is used by modern industry, in the form of pneumatic controls. Hydraulic controls are similar to pneumatic ones, but use fluid pressure instead of air pressure, and are more precise due to the less compressible quality of the fluids used.