SCHEDULE 1 Definitions of Units of Measurement
Part I Measurement of Length
Metric units
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 II Measurement of Area
Imperial units
Metric units
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 Measurement of Volume
Metric units
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 Measurement of Capacity
F4Imperial unit
Metric units
Hectolitre = | 100 litres. |
LITRE = | a cubic decimetre. |
Decilitre = | 1/10 litre. |
Centilitre = | 1/100 litre. |
Millilitre = | 1/1000 litre. |
Part V Measurement of Mass or Weight
F8Imperial unit
Metric units
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 VIDefinitions of certain units which may not be used for trade except as supplementary indications
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. | |
F13Fluid ounce | F13= | F131/20 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. | |
F14POUND | F14= | F140.453 592 37 kilogram. | |
F15 Ounce | F15= | F151/16 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. | |
Part VII Measurement of Electricity
1. | (a) AMPERE | F16for 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) 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 F17, where the second has the meaning given in the definition of “AMPERE”. | |
2. | Kilowatt | = 1000 watts. |
Megawatt | = one million watts. |