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Pressure
Gauge pressure and absolute pressure
In boiler technology, it is common practice to specify all pressure values as relative overpressure to atmospheric pressure of 1 bar.
The unit [bar] or [barg] is used in these contexts.
The conversion from gauge pressure to absolute pressure is therefore as follows:
pabsolute = p + 1.01325 bar
Conversion from gauge pressure to absolute pressure:
Normal conditions and standard conditions
Normal conditions (in accordance with DIN 1343):
pn = 101,325 Pa = 1.01325 bar = 1 atm
Tn = 273.15 K = 0 °C
Standard conditions (STP, IUPAC):
p0 = 100,000 Pa = 1.0 bar
T0 = 273.15 K = 0 °C
Standard environmental condition (SATP, IUPAC):
p0 = 100,000 Pa = 1.0 bar
T0 = 298.15 K = 25 °C