X1ANNEX
Annotations:
Editorial Information
CHAPTER ILEGAL UNITS OF MEASUREMENT REFERRED TO IN ARTICLE 1 (a)
4.UNITS AND NAMES OF UNITS PERMITTED IN SPECIALIZED FIELDS ONLY
Quantity | Unit | ||
|---|---|---|---|
Name | Symbol | Value | |
Vergency of optical systems | dioptre* | 1 dioptre = 1 m-1 | |
Mass of precious stones | metric carat | 1 metric carat = 2 × 10-4 kg | |
Area of farmland and building land | are | a | 1 a = 102 m2 |
Mass per unit length of textile yarns and threads | tex* | tex* | 1 tex = 10-6 kg · m-1 |
F1Blood pressure and pressure of other body fluids | Millimetre of mercury | mm Hg(*) | 1 mm Hg = 133,322 Pa |
Effective cross-sectional area | Barn | b | 1 b = 10-28 m2 |
Note:
F2The prefixes and their symbols listed in 1.3 may be used in conjunction with the above units and symbols, with the exception of the millimetre of mercury and its symbol. The multiple of 102a is, however, called a ‘hectare’.
Substituted by Corrigendum to Council Directive 80/181/EEC of 20 December 1979 on the aproximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (Official Journal of the European Communities No L 39 of 15 February 1980).