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# The International System of Metric Units

### A French lesson!

It is common in scientific texts to come across measurements that are given in S.I. units. What does *"S.I."* stand for?

S.I. is an abbreviation of *Système Internationale* or International System: our metric system of measurements.

It is an internationally standardised system, giving a common language between nations and between the different branches of science and technology.

Over the next few pages, you will meet some of the S.I. units and the ways to modify them to express any given measurement. As usual, you can follow the topics in any order (just keep coming back to this page to jump to the link), or just go through in order.

The topics we will cover are:

- Structure of the S.I. system
- History of the S.I. system
- The S.I. base units
- Prefixes
- (including a table of prefixes).

- The standards
- Other convenient units

Finally, there are some optional exercises to test your understanding.

On to the structure of S.I. units

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