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Units of measure

In the international system (SI) the physical and technical units are validated as follows :
 Unit of length Meter (symbol m) Unit of mass Kilogram (symbol Kg) Unit of time Second (symbol s) Unit electrical current Ampére (symbol A) Unit of temperature Kelvin (symbol K) Unit of luminosity Candela (symbol cd) Pressure Old measuring unit: Kilopond per cm² Kp/cm² Meter of water column mH20 Millimeter of mercury column mmHg Metric atmosphere at Atmosphere atm They were replaced in the SI from Pascal
One Pascal corresponds at the pressure of 1 Newton to act on the area of 1 m².
 1 Pascal = 1N (symbol Pa) 1m2
Unit Pa is a very low value and for the standard industrial is used the
Bar (symbol bar) = 0.1 MegaPascal (symbol Mpa=1.000.000 Pa).
The conversion from the old unit of measure to the new one SI is the following:1 Kp/cm² = 0,981 bar
1 bar = 1,02 Kp/cm²

The conversion in the SI unit is possible also in the countries

where is not yet used the metric system.
Conversion:1 bar = 14,50 psi
1 psi = 0,07 bar =7.000 Pa Pressure values, except specific references, are relative to the atmospheric pressure.