UNITS OF PRESSURE
Common units of pressure are Pascal (N/m2), Bar, Kgf/cm2, PSI (lbf/in2), Torr (mmHg) and mmH2O. Pressure less than 1 PSI are normally considered as low pressure and low pressure are usually calibrated in inches of water (1PSI = 27.7 inH2O).
CONVERTING PRESSURE MEASUREMENT UNITS
Pressure measurement may be converted from one unit to another by using chart below.
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more details : Instrumentation Converter - by Automationforum.in