# 1 Units of measurement

The international system of units (Le Système International d’Unites, abbreviated to SI) was developed in France during the 18th century in an effort to create a unified and rational system of weights and measures. The SI system was adopted as the world standard in 1960.

Mass and volume (of liquids) are the quantities chemists most often work with and later in this session you will look at how these are determined in the laboratory, but first a look at their SI units.

OpenLearn - Discovering chemistry
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