# Council Directive of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (80/181/EEC), Division 1.4: Special authorized names and symbols of decimal multiples and submultiples of SI units

Extent: E+W+S+N.I.

The two symbols ‘ I ’ and ‘ L ’ may be used for the litre unit.
(Sixteenth CGPM (1979), resolution 6).
Unit listed in the International Bureau of Weights and Measures booklet as among the units to be permitted temporarily.
Quantity
Unit
Name
Symbol
Value
Volume
litre
1 or L
1 l = 1 dm 3 = 10 -3 m 3
Mass
tonne
t
1 t = 1 Mg = 10 3 kg
Pressure, stress
bar
bar
1 bar = 10 5 Pa

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Source: https://www.legislation.gov.uk/eudr/1980/181/annex/chapter/I/division/1/division/1.4 (the official version)
Page: https://openlegislation.uk/eu-directive-1980-181/annex/chapter-I/division-1/division-1.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.