Sections 1(2), 8(1).
Imperial units
| Mile = | 1760 yards. |
| YARD = | 0·9144 metre. |
| Foot = | 1/3 yard. |
| Inch = | 1/36 yard. |
| 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. |
| 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. |
| 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. |
| 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. |
| GALLON = | 4·546 09 cubic decimetres. |
| Quart = | 1/4 gallon. |
| Pint = | 1/2 quart. |
| Gill = | 1/4 pint. |
| Fluid ounce = | 1/20 pint. |
| Hectolitre = | 100 litres. |
| LITRE = | a cubic decimetre. |
| Decilitre = | 1/10 litre. |
| Centilitre = | 1/100 litre. |
| Millilitre = | 1/1000 litre. |
| POUND = | 0·453 592 37 kilogram. |
| Ounce = | 1/16 pound. |
| Ounce troy = | 12/175 pound. |
| 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. |
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. |
| 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. |