# Pressure

PRESSURE P030

The term “pressure” is commonly used in the positive displacement pump business, but not generally used by centrifugal pump people; they substitute the term head instead.

Here are some conversions you will find useful to convert pressure to liquid head in both the inch and metric systems:

 newton per square meter N/M2 or Pascal (Pa) kilo – pascal kPa bar kilogram force per square centi-meter kgf/cm2 pound force per square inch lbf/in2 foot of water meter of water millimeter of mercury mm Hg inch of mercury in Mg 1 0.001 1×105 1.02X105 1.045 X10-4 3.35X10-4 1.02 X 10-4 0.0075 2.95 X 10-4 1000 1 0.01 1.02 X10-2 0.145 0.335 0.102 7.5 0.295 100000 100 1 1.02 14.5 33.52 10.2 750.1 29.53 98067 98.07 0.981 1 14.22 32.81 10 735.6 28.96 6895 6.895 0.069 0.0703 1 2.31 0.703 51.72 2.036 2984 2.984 0.03 0.0305 0.433 1 0.305 22.42 0.882 9789 9.789 0.0980. 0.1 1.42 3.28 1 73.42 2.891 133.3 0.133 0.0013 0.0014 0.019 0.045 0.014 1 0.039 3386 3.386 0.0338 0.0345 0.491 1.133 0.345 25.4 1

1 Pascal equals 1 newton per square meter (1Pa = 1N/M2)

1 mm Hg is also called 1 “torr”

The international standard atmosphere (1 atm) = 101325 pascals or 1.01325 bar. This is equal to 1.03323 kgf/cm2 or 14.6959 lbf/in2

1 millibar = 100 pascal (1mb = 100 Pa)

### Posted

• On February 16, 2018