The Units of Measurement Regulations 2009

SCHEDULE Substituted paragraph 2(3) for Schedule 1 to the Units of Measurement Regulations 1986

““(3) “SI“ derived units with special names and symbols

“Quantity	“Unit Name	“Unit Symbol	“Expression in terms of other SI units	“Expression 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*, radiant flux	“Watt	“W	“J.s“-1	“m“2“.kg.s“-3
“Electric charge, quantity of electricity	“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		“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, dose equivalent index	“sievert	“Sv	“J.kg“-1	“m“2.“s“-2
“Catalytic activity	“Katal	“kat		“mol.s“-1

“Notes

“Units derived from SI base units may be expressed in terms of the units listed in this Schedule.

“In particular, SI derived 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.

“*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.”