[X1 ANNEX U.K.

Editorial Information

X1 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).

CHAPTER I U.K. LEGAL UNITS OF MEASUREMENT REFERRED TO IN ARTICLE 1 (a)

1. SI UNITS AND THEIR DECIMAL MULTIPLES AND SUBMULTIPLES U.K.

[F1 1.2. SI derived units] U.K.

[F1 1.2.3. SI derived units with special names and symbols U.K.

a 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.
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		m 2 · 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	m 2 · kg · s –2
Power a , radiant flux	watt	W	J · s –1	m 2 · kg · s –3
Quantity of electricity, electric charge	coulomb	C		s · A
Electric potential, potential difference, electromotive force	volt	V	W · A –1	m 2 · kg · s –3 · A –1
Electric resistance	ohm	Ω	V · A –1	m 2 · kg · s –3 · A –2
Conductance	siemens	S	A · V –1	m –2 · kg –1 · s 3 · A 2
Capacitance	farad	F	C · V –1	m –2 · kg –1 · s 4 · A 2
Magnetic flux	weber	Wb	V · s	m 2 · kg · s –2 · A –1
Magnetic flux density	tesla	T	Wb · m –2	kg · s –2 · A –1
Inductance	henry	H	Wb · A –1	m 2 · 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	m 2 · s –2
Dose equivalent	sievert	Sv	J · kg –1	m 2 · s –2
Catalytic activity	katal	kat		mol · s –1

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.] ]

Textual Amendments

F1 Substituted by Directive 2009/3/EC of the European Parliament and of the Council of 11 March 2009 amending Council Directive 80/181/EEC on the approximation of the laws of the Member States relating to units of measurement (Text with EEA relevance).