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Ss

S.I.

• S.I. is short for International System of Units,
the modern form of the metric measurement system
and the most widely used system in the world.
• the S.I. base units are mass - the kilogram,
time - the second, length - the metre.
• all other units are derived from these.

EXAMPLES:

Metric Units ~ Length

10 millimetres = 1 centimetre, cm
10 centimetres = 1 decimetre, dm
10 decimetres = 1 metre, m
10 metres = 1 decametre, Dm or dkm
10 decametres = 1 hectometre, hm
10 hectometres = 1 kilometre, km
1000 metres = 1 kilometre, km

Metric Units ~ Area

1 square metre = 10 000 square centimetres, cm2
1 hectare = 10 000 square metres, m2
1 square kilometre = 100 hectares, ha

Metric Units ~ Mass

1000 milligrams = 1 gram, g
1000 grams = 1 kilogram, kg
1000 kilograms = 1 tonne, t

Metric Units ~ Volume

1000 cubic millimetres = 1 cubic centimetre, cm3
1000 cubic centimetres = 1 cubic decimetre, dm3
1,000 cubic decimetres = 1 cubic metre, m3
1,000,000 cubic centimetres = 1 cubic metre, m3

Metric Units ~ Capacity
(fluid volume)

10 millilitres = 1 centilitre, cl or cL
10 centilitres = 1 decilitre, dl or dL
10 decilitres = 1 litre, l or L
1000 litres = 1 kilolitre, kl or kL
1,000,000 litres = 1 megalitre, Ml or ML
1,000,000,000 litres = 1 gigalitre, Gl or GL
1,000,000,000,000 litres = cubic kilometre = 1 teralitre, Tl or TL

Metric Units ~ Temperature

Celsius, ºC also known as Centigrade, ºC