What is pressure?

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Pressure is a measuement of force in this case relative to our normal atmospheric pressure (1 bar or approx 15psi).  Most Air Tools  etc operate at a pressure between 2 bar (30psi) and 6 bar (90psi).  Spray painting requires lower pressure than some air tools, as too high a pressure will cause the paint or material to over atomise resulting in the material being lost to the atmosphere.  Most car tyres are inflated to between 1.5 - 2.5bar (22-35psi).  Most air tools including air drill, air sanders, air nailers and air chisels will operate at a pressure of 6 bar (90psi) approx.

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