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Atmospheric, Gauge, Vacuum and Absolute Pressure

Datum is at absolute zero line           P abs = Absolute pressure = P +Pat

And                                                     P abs =Pal- P vac

P abs =pressure measured from absolute zero pressure is called absolute pressure

P g = Gauge pressure      =Pressure measured above the atmospheric pressure is called gauge pressure,here atmospheric pressure is taken as zero.

P vac = Vacuum pressure = Pressure below the atmospheric pressure is the vacuum pressure.

 

Pat =Atmospheric Pressure