The SI system is based on six primary units as follows:
Basic SI units
Quantity Unit Symbol
Length Metre m
Mass Kilogramme kg
Time Second s
Electric current Ampere A
Temperature Kelvin K
Luminous Intensity Candela cd
In addition to these there are a number of supplementary and derived units. We give below a selection of those which are most likely to be required by students using this book. A full list of the SI Units and conventions is given in BSI publication PD 5686.
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