X1ANNEX
CHAPTER ILEGAL UNITS OF MEASUREMENT REFERRED TO IN ARTICLE 1 (a)
1.SI UNITS AND THEIR DECIMAL MULTIPLES AND SUBMULTIPLES
F11.2.SI derived units
F11.2.3.SI derived units with special names and symbols
Quantity | Unit | Expression | ||
|---|---|---|---|---|
Name | Symbol | In terms of other SI units | In terms of SI base units | |
Plane angle | radian | rad | m · m–1 | |
Solid angle | steradian | sr | m2 · m–2 | |
Frequency | hertz | Hz | s–1 | |
Force | newton | N | m · kg · s–2 | |
Pressure, stress | pascal | Pa | N · m–2 | m–1 · kg · s–2 |
Energy, work; quantity of heat | joule | J | N · m | m2 · kg · s–2 |
Power7, radiant flux | watt | W | J · s–1 | m2 · kg · s–3 |
Quantity of electricity, electric charge | coulomb | C | s · A | |
Electric potential, potential difference, electromotive force | volt | V | W · A–1 | m2 · kg · s–3 · A–1 |
Electric resistance | ohm | Ω | V · A–1 | m2 · kg · s–3 · A–2 |
Conductance | siemens | S | A · V–1 | m–2 · kg–1 · s3 · A2 |
Capacitance | farad | F | C · V–1 | m–2 · kg–1 · s4 · A2 |
Magnetic flux | weber | Wb | V · s | m2 · kg · s–2 · A–1 |
Magnetic flux density | tesla | T | Wb · m–2 | kg · s–2 · A–1 |
Inductance | henry | H | Wb · A–1 | m2 · kg · s–2 · A–2 |
Luminous flux | lumen | lm | cd · sr | cd |
Illuminance | lux | lx | lm · m–2 | m–2 · cd |
Activity (of a radionuclide) | becquerel | Bq | s–1 | |
Absorbed dose, specific energy imparted, kerma, absorbed dose index | gray | Gy | J · kg–1 | m2 · s–2 |
Dose equivalent | sievert | Sv | J · kg–1 | m2 · s–2 |
Catalytic activity | katal | kat | mol · s–1 | |
Special names for the unit of power: the name volt–ampere (symbol ‘VA’) when it is used to express the apparent power of alternating electric current, and var (symbol ‘var’) when it is used to express reactive electric power. The ‘var’ is not included in GCPM resolutions. | ||||
Units derived from SI base units may be expressed in terms of the units listed in Chapter I.
In particular, derived SI units may be expressed by the special names and symbols given in the above table; for example, the SI unit of dynamic viscosity may be expressed as m–1 · kg · s–1 or N · s · m–2 or Pa · s.
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).