What is the purpose of standard liters and norm liters?
In contrast to liquids, gases can be compressed, so it is important to know the density of the gas
used. This in turn is dependent on pressure and temperature, i.e. if two quantities of gas are to be
compared with one another, then the current pressure in the pipe and the current temperature of
the medium must be known.
We supply general tables relating to norm liters 0°C 1013 mbar a
The two quantities are defined as follows:
Unit Pressure Temperature
Standard liter 1013.25 mbar a 20°Celsius
Norm liter 1013.25 mbar a 0° Celsius
The US standard liter corresponds to the German norm liter (0°C 1013.25 mbar a).
However, there are other reference temperatures. Gas suppliers use a reference temperature of 15
°C.
Conversion of standard liter (Stdl) into norm liter (ln) and vice versa:
Stdl = (ln/273.15)*293.15
ln = (Stdl/293.15)*273.15
Further information on this subject is given in the FAQs at www.voegtlin.com
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