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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) |
