Length
kilometre km = 1000 metres
metre m = length of path travelled by light in
vacuum during a time interval of
1/299 792 458 of a second
decimetre dm = 1/10 metre
centimetre cm = 1/100 metre
millimetre mm = 1/1000 metre
micron μ = 1/100 000 metre
Area
hectare ha = 10 000 m2
are a = 100 m2
Volume
cubic metre m3 = m m m
cubic millimetre mm3 = 1 /1000 000 000 m3
Capacity
hectolitre hl = 100 litres
litre l = cubic decimetre
decilitre dl = 1/10 litre
centilitre cl = 1/100 litre
millilitre ml = 1/1000 litre
Mass or weight
tonne t = 1000 kilograms
kilogram kg = 1000 grams
gram g = 1/1000 kilogram
milligram mg = 1/1000 gram
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