Pascal (Pa) is the SI unit of pressure and is named after the French physicist Blaise Pascal. Definationen for Pascal is 1 Pa = 1 N/m 2 .
The Bar is defined as 1 bar = 100 kPa.
Meter of water column (MVPs) are based on the amount of pressure one meter high column of water forms on the bottom of a container. According to the Swedish definition, the water kept at a temperature 4˚C but as this may vary between countries, the scale is inappropriate to use internationally.
The atmosphere (atm) is equivalent to the atmospheric pressure at sea level.