Weights and Measures Act 1985

Sections 1(2), 8(1).

SCHEDULE 1 U.K. Definitions of Units of Measurement

Part I U.K. Measurement of Length

Imperial units

F1 . . .	F1 . . .
F1 . . .	F1 . . .
F1 . . .	F1 . . .
F1 . . .	F1 . . .

Textual Amendments

F1 Sch. 1 Pts. I, II: entries omitted (1.10.1995) by virtue of S.I. 1994/2867, reg. 6(5)(a)

Metric units U.K.

Kilometre =	1000 metres.
METRE	is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
Decimetre =	1/10 metre.
Centimetre =	1/100 metre.
Millimetre =	1/1000 metre.

Part II U.K. Measurement of Area

Imperial units U.K.

F2 . . .	F2 . . .
F2 . . .	F2 . . .
F2 . . .	F2 . . .

Textual Amendments

F2 Sch. 1 Pts. I, II: entries omitted (1.10.1995) by virtue of S.I. 1994/2867, reg. 6(5)(a)

Metric units U.K.

Hectare =	100 ares.
Decare =	10 ares.
Are =	100 square metres.
SQUARE METRE=	a superficial area equal to that of a square each side of which measures one metre.
Square decimetre =	1/100 square metre.
Square centimetre =	1/100 square decimetre.
Square millimetre =	1/100 square centimetre.

Part III U.K. Measurement of Volume

Metric units U.K.

CUBIC METRE =	a volume equal to that of a cube each edge of which measures one metre.
Cubic decimetre =	1/1000 cubic metre.
Cubic centimetre =	1/1000 cubic decimetre.
Hectolitre =	100 litres.
LITRE =	a cubic decimetre.
Decilitre =	1/10 litre.
Centilitre =	1/100 litre.
Millilitre =	1/1000 litre.

Part IV U.K. Measurement of Capacity

[F3 Imperial unit] U.K.

Textual Amendments

F3 Heading in Sch. 1 Pt. IV substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(a)(i)

F4 . . .	F4 . . .
F4 . . .	F4 . . .
Pint =	[F5 0.568 261 25 cubic decimetre.]
F4 . . .	F4 . . .
F6 . . .	F6 . . .

Textual Amendments

F4 Sch. 1 Pt. IV: definitions of “gallon”, “quart” and “gill” omitted (1.10.1995) by virtue of S.I. 1994/2867, reg. 6(5)(b)(i)

F5 Sch. 1 Pt. IV: definition substituted (1.10.1995) by S.I. 1994/2867, reg. 6(5)(b)(ii)

F6 Sch. 1 Pt. IV: definition of “fluid ounce” omitted (1.1.2000) by virtue of S.I. 1994/2867, reg. 7(3)(a)(ii)

Metric units U.K.

Hectolitre =	100 litres.
LITRE =	a cubic decimetre.
Decilitre =	1/10 litre.
Centilitre =	1/100 litre.
Millilitre =	1/1000 litre.

Part V U.K. Measurement of Mass or Weight

[F7 Imperial unit] U.K.

Textual Amendments

F7 Heading in Sch. 1 Pt. V substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(b)(i)

F8 . . .	F8 . . .
F8 . . .	F8 . . .
[F9 OUNCE TROY=]	[F9 0.031 103 476 8 kilogram.]

Textual Amendments

F8 Sch. 1 Pt. V: definitions of “pound” and “ounce” omitted (1.1.2000) by virtue of S.I. 1994/2867, reg. 7(3)(b)(ii)

F9 Sch. 1 Pt. V: definition of “ounce troy” substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(b)(iii)

Metric units U.K.

Tonne, metric tonne =	1000 kilograms.
KILOGRAM=	is the unit of mass; it is equal to the mass of the international prototype of the kilogram.
Hectogram =	1/10 kilogram.
Gram =	1/1000 kilogram.
Carat (metric) =	1/5 gram.
Milligram =	1/1000 gram.

[F10 PART VI U.K. Definitions of certain units which may not be used for trade except as supplementary indications

Textual Amendments

F10 Sch. 1 Pt. VI substituted (1.10.1995) by S.I. 1994/2867, reg. 6(5)(c)

			Measurement of length
Mile	=	1760 yards.
Furlong	=	220 yards.
Chain	=	22 yards.
YARD	=	0.9144 metre.
Foot	=	1/3 yard.
Inch	=	1/36 yard.
			Measurement of area
Square mile	=	640 acres.
Acre	=	4840 square yards.
Rood	=	1210 square yards.
Square yard	=	a superficial area equal to that of a square each side of which measures one yard.
Square foot	=	1/9 square yard.
Square inch	=	1/144 square foot.
			Measurement of volume
Cubic yard	=	a volume equal to that of a cube each edge of which measures one yard.
Cubic foot	=	1/27 cubic yard.
Cubic inch	=	1/1728 cubic foot.
			Measurement of capacity
Bushel	=	8 gallons.
Peck	=	2 gallons
GALLON	=	4.54609 cubic decimetres.
Quart	=	¼ gallon.
Gill	=	¼ pint.
[F11 Fluid ounce]	[F11 =]	[F11 1/20 pint.]
Fluid drachm	=	1/8 fluid ounce.
Minim	=	1/60 fluid drachm.
			Measurement of mass or weight
Ton	=	2240 pounds.
Hundredweight	=	112 pounds.
Cental	=	100 pounds.
Quarter	=	28 pounds.
Stone	=	14 pounds.
[F12 POUND]	[F12 =]	[F12 0.453 592 37 kilogram.]
[F13 Ounce]	[F13 =]	[F13 1/16 pound]
Dram	=	1/16 ounce.
Grain	=	1/7000 pound.
Pennyweight	=	24 grains.
Ounce apothecaries	=	480 grains.
Drachm	=	1/8 ounce apothecaries.
Scruple	=	1/3 drachm.
Metric ton	=	1000 kilograms.
Quintal	=	100 kilograms.]

Textual Amendments

F11 Sch. 1 Pt. VI: definition of “fluid ounce” inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(i)

F12 Sch. 1 Pt. VI: definition of “pound” inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(ii)

F13 Sch. 1 Pt. VI: definition of “ounce” inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(ii)

Part VII U.K. Measurement of Electricity

1.	(a) AMPERE	is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10–7 newton per metre of length.
	(b) OHM	is the electric resistance between two points of a conductor when a constant potential difference of 1 volt, applied between the two points, produces in the conductor a current of 1 ampere, the conductor not being the seat of any electromotive force.
	(c) VOLT	is the difference of electric potential between two points of a conducting wire carrying a constant current of 1 ampere when the power dissipated between these points is equal to 1 watt.
	(d) WATT	is the power which in one second gives rise to energy of 1 joule.
2.	Kilowatt	= 1000 watts.
	Megawatt	= one million watts.