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Weights and Measures Act 1985

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Version Superseded: 01/10/1995

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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

Mile =1760 yards.
YARD =0·9144 metre.
Foot =1/3 yard.
Inch =1/36 yard.

Metric unitsU.K.

Kilometre =1000 metres.
METREis 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 IIU.K. Measurement of Area

Imperial unitsU.K.

Acre =4840 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.

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

Imperial unitsU.K.

GALLON =4·546 09 cubic decimetres.
Quart =1/4 gallon.
Pint =1/2 quart.
Gill =1/4 pint.
Fluid ounce =1/20 pint.

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

Imperial unitsU.K.

POUND =0·453 592 37 kilogram.
Ounce =1/16 pound.
Ounce troy =12/175 pound.

Metric unitsU.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.

Part VIU.K. Definitions of Certain Units Which May Not be Used for Trade

Measurement of length

Furlong =220 yards.
Chain =22 yards.

Measurement of area

Square mile =640 acres.
Rood =1210 square yards.
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.
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.
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.

Part VIIU.K. Measurement of Electricity

1.(a) AMPEREis 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) 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.
2.Kilowatt= 1000 watts.
Megawatt= one million watts.

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