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The International System of Units (SI)
INTRODUCTION
In 1960, 36 nations signed a treaty and created
an international system of units based on only one
set of primary standards, which were housed in Sèvres,
France. The entire system is officially called "Le
Système International d'Unités" (SI), and is
called the International System in
English-speaking countries. The SI is essentially the
same as what we have come to know as the metric
system.
| DEFINITION | The SI base units are the official international units for the seven different kinds of physical quantities that can be measured. |
All other SI units are called derived units; that is, they can be defined in terms of the seven basic units. For example, the newton (N) is defined as 1 kg m/s2 (kilogram meter per second per second).
Quantity |
Unit |
| length | metre (m) |
| time | second (s) |
| mass | kilogram (kg) |
| electric current | ampere (A) |
| temperature | kelvin (K) |
| luminous intensity | candela (cd) |
| amount of substance | mole (mol) |
