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Chapter:

68 PDFTitle:WEIGHTS AND MEASURES ORDINANCEGazette Number:
Schedule:1Heading:DEFINITIONS OF UNITS OF MEASUREMENTVersion Date:30/06/1997

[section 6(2)]
PART I

Measurement of Length

(a) Metric Units
    1 kilometre
= 1000 metres
1 metre= the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second
1 decimetre= 0.1 metre
1 centimetre= 0.01 metre
    1 millimetre
= 0.001 metre

(b) Imperial Units
    1 mile
= 1 760 yards
    1 furlong
= 220 yards
    1 chain
= 22 yards
    1 yard
= 0.9144 metre exactly
    1 foot
= 1/3 yard
    1 inch
= 1/36 yard

(c) Chinese Units
    1 chek
= 0.371475 metre
    1 tsun
= 0.1 chek
    1 fan
= 0.1 tsun
PART II
Measurement of Area

(a) Metric Units
    1 hectare
= 100 ares
    1 are
= 100 square metres
    1 square metre
= an area equal to that of a square each side of which measures one metre
    1 square decimetre
= 0.01 square metre
    1 square centimetre
= 0.01 square decimetre
    1 square millimetre
= 0.01 square centimetre

(b) Imperial Units
    1 square mile
= 640 acres
    1 acre
= 4840 square yards
    1 rood
= 1210 square yards
    1 square yard
= an area equal to that of a square each side of which measures one yard
    1 square foot
= 1/9 square yard
    1 square inch
= 1/144 square foot
PART III
Measurement of Volume

(a) Metric Units
    1 cubic metre
= a volume equal to that of a cube each edge of which measures one metre
    1 cubic decimetre
= 0.001 cubic metre
    1 cubic centimetre
= 0.001 cubic decimetre
    1 litre
= a volume equal to that of a cubic decimetre
    1 decilitre
= 0.1 litre
    1 centilitre
= 0.01 litre
    1 millilitre
= 0.001 litre

(b) Imperial Units
    1 cubic yard
= a volume equal to that of a cube each edge of which measures one yard
    1 cubic foot
= 1/27 cubic yard
    1 cubic inch
= 1/1728 cubic foot
PART IV
Measurement of Capacity

(a) Metric Units
    1 hectolitre
= 100 litres
    1 litre
= a volume equal to that of a cubic decimetre
    1 decilitre
= 0.1 litre
    1 centilitre
= 0.01 litre
    1 millilitre
= 0.001 litre

(b) Imperial Units
    1 gallon
= 4.54609 cubic decimetres
    1 quart
= 1/4 gallon
    1 pint
= 1/2 quart
    1 gill
= 1/4 pint
    1 fluid ounce
= 1/20 pint
PART V
Measurement of Mass or Weight

(a) Metric Units
    1 tonne
= 1000 kilograms
    1 kilogram
= a unit of mass equal to the international prototype of the kilogram kept by the International Bureau of Weights and Measures
    1 gram
= 0.001 kilogram
    1 metric carat
= 1/5 gram
    1 milligram
= 0.001 gram

(b) Imperial Units
    1 ton
= 2240 pounds
    1 hundredweight
= 112 pounds
    1 quarter
= 28 pounds
    1 stone
= 14 pounds
    1 pound
= 0.45359237 kilogram exactly
    1 ounce
= 1/16 pound
    1 dram
= 1/256 pound
    1 grain
= 1/7000 pound
    1 ounce troy
= 12/175 pound

(c) Chinese Units
    1 picul (tam)
= 100 catties
    1 catty (kan)
= 0.60478982 kilogram
    1 tael (leung)
= 1/16 catty
    1 mace (tsin)
= 1/160 catty
    1 candareen (fan)
= 1/1600 catty
    1 tael troy
= 37.429 grams
    1 mace troy
= 1/10 tael troy
    1 candareen troy
= 1/10 mace troy
(Amended L.N. 344 of 1988)
(Enacted 1987)