• The International System of Units is a system of measurement based on the metric system.
  • The metric system was originally established in France in 1795.
  • The SI was adopted by international agreement in 1960 and is composed of seven base units.
  • Five of these units are commonly used in chemistry.
  • All other measurement quantities, such as volume, force, and energy, can be derived from these seven units.
  • The map in Figure below shows the adoption of the SI units in countries around the world.
  • The United States has legally adopted the metricsystem for measurements, but does not use it in everyday practice.
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