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The cut-out pressure should be in accordance with the pressure setting of the piece number being used. (Common cut-out pressures are between 105-125 psi.) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts-in the compressor.
We know that standard atmospheric pressure is 14.7 pounds per square inch. We also know that air pressure decreases as we rise in the atmosphere. 1013.25 mb = 101.325 kPa = 29.92 inches Hg = 14.7 pounds per in2 = 760 mm of Hg = 34 feet of water.Air pressure can simply be measured with a barometer by measuring how the level of a liquid changes due to different weather conditions.013.25 mb = 101.325 kPa = 29.92 inches Hg = 14.7 pounds per in2 = 760 mm of Hg = 34 feet of water. Air pressure can simply be measured with a barometer by measuring how the level of a liquid changes due to different weather conditions.