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Weights and Measures Act 1985

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Sections 1(2), 8(1).

SCHEDULE 1U.K. Definitions of Units of Measurement

Part IU.K. Measurement of Length

Imperial units

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

Textual Amendments

F1Sch. 1 Pts. I, II: entries omitted (1.10.1995) by virtue of S.I. 1994/2867, reg. 6(5)(a)

Metric unitsU.K.

Kilometre =1000 metres.
METRE [F2for which the symbol “m” is used, is the SI unit of length, defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m/s, where the second is defined by taking the fixed numerical value of the caesium frequency ΔvCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.]
Decimetre =1/10 metre.
Centimetre =1/100 metre.
Millimetre =1/1000 metre.

Part IIU.K. Measurement of Area

Imperial unitsU.K.

F3. . .F3. . .
F3. . .F3. . .
F3. . .F3. . .

Textual Amendments

F3Sch. 1 Pts. I, II: entries omitted (1.10.1995) by virtue of S.I. 1994/2867, reg. 6(5)(a)

Metric unitsU.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 IIIU.K. Measurement of Volume

Metric unitsU.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 IVU.K. Measurement of Capacity

[F4Imperial unit]U.K.

Textual Amendments

F4Heading in Sch. 1 Pt. IV substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(a)(i)

F5. . .F5. . .
F5. . .F5. . .
Pint =[F6 0.568 261 25 cubic decimetre.]
F5. . .F5. . .
F7. . .F7. . .

Textual Amendments

F5Sch. 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)

F6Sch. 1 Pt. IV: definition substituted (1.10.1995) by S.I. 1994/2867, reg. 6(5)(b)(ii)

F7Sch. 1 Pt. IV: definition of

fluid ounce

omitted (1.1.2000) by virtue of S.I. 1994/2867, reg. 7(3)(a)(ii)

Metric unitsU.K.

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

Part VU.K. Measurement of Mass or Weight

[F8Imperial unit]U.K.

Textual Amendments

F8Heading in Sch. 1 Pt. V substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(b)(i)

F9. . .F9. . .
F9. . .F9. . .
[F10OUNCE TROY=][F10 0.031 103 476 8 kilogram.]

Textual Amendments

F9Sch. 1 Pt. V: definitions of

pound

and

ounce

omitted (1.1.2000) by virtue of S.I. 1994/2867, reg. 7(3)(b)(ii)

F10Sch. 1 Pt. V: definition of

ounce troy

substituted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(b)(iii)

Metric unitsU.K.

Tonne, metric tonne =1000 kilograms.
KILOGRAM [F11for which the symbol “kg” is used, is the SI unit of mass, defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 x 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the second is defined by taking the fixed numerical value of the caesium frequency ΔvCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.]
Hectogram =1/10 kilogram.
Gram =1/1000 kilogram.
Carat (metric) =1/5 gram.
Milligram =1/1000 gram.

[F12PART VIU.K.Definitions of certain units which may not be used for trade except as supplementary indications

Textual Amendments

F12Sch. 1 Pt. VI substituted (1.10.1995) by S.I. 1994/2867, reg. 6(5)(c)

F13Measurement 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=87 gallons.
Peck=2 gallons
GALLON=4.54609 cubic decimetres.
Quart=¼ gallon.
Gill=¼ pint.
[F14Fluid ounce][F14=][F141/20 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.
[F15POUND][F15=][F15 0.453 592 37 kilogram.]
[F16 Ounce][F16=][F161/16 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

F13Sch. 1 Pt. VI substituted (1.10.1995) by S.I. 1994/2867, reg. 6(5)(c)

F14Sch. 1 Pt. VI: definition of

Fluid ounce

inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(i)

F15Sch. 1 Pt. VI: definition of

POUND

inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(ii)

F16Sch. 1 Pt. VI: definition of

Ounce

inserted (1.1.2000) by S.I. 1994/2867, reg. 7(3)(c)(ii)

Part VIIU.K. Measurement of Electricity

1.(a) AMPERE [F17for which the symbol “A” is used, is the SI unit of electric current, defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 × 10-19 when expressed in the unit C, which is equal to A s, where the second is defined by taking the fixed numerical value of the caesium frequency ΔvCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.]
(b) OHMis 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) VOLTis 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) WATTis the power which in one second gives rise to energy of 1 joule [F18, where the second has the meaning given in the definition of “AMPERE”].
2.Kilowatt= 1000 watts.
Megawatt= one million watts.

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