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# INFORMATION ABOUT THE EMPERIAL (U.K.) SYSTEM AND UNITS ## The Imperial (U.K.) System of Measurements

 category units and relationship length 12 inches = 1 foot 3 feet = 1 yard 22 yard = 1 chain 10 chains = 1 furlong 8 furlong = 1 mile 5280 feet = 1 mile 1760 yards = 1 mile area 144 square inches = 1 square foot 9 square feet = 1 square yard 4840 square yards = 1 acre 640 acres = 1 square mile Volume 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard Capacity 20 fluid ounces = 1 pint 4 gills = 1 pint 2 pints = 1 quart 4 quarts = 1 gallon 8 pints = 1 gallon Mass (Avoirdupois) 437.5 grains = 1 ounce 16 ounces = 1 pound 14 pound = 1 stone 8 stones = 1 hundredweight [cwt] 20 cwt = 1 ton Troy Weights 24 grains = 1 pennyweight 20 pennyweights = 1 ounce 12 ounces = 1 pound Apothecaries' Measures 20 minims = 1 fl.scruple 3 fl.scruples = 1 fl.drachm 8 fl.drachms = 1 fl.ounce 20 fl.ounces = 1 pint Apothecaries' Weights 20 grains = 1 scruple 3 scruples = 1 drachm 8 drachms = 1 ounce 12 ounces = 1 pound
Notes:
• The difference between volume and capacity is there for historical reasons only
• Note particularly that the UK gallon is a different size to the US gallon so that NO liquid measures of the same name are the same size in the UK and US systems. Also that the ton(UK) is 2240 pounds while a ton(US) is 2000 pounds. These are also referred to as a long ton and short ton respectively
• The old Imperial (now UK) system was originally defined by three standard measures: the yard, the pound and the gallon which were held in London. They are now defined by reference to the S I measures of the metre, the kilogram and the litre These equivalent measures are exact.
 1 yard = 0.9144 metres - same in US 1 pound = 0.453 592 37 kilograms - same in US 1 gallon = 4.546 09 litres - different in US

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