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: '''SI''' stands for "Système international".
: '''SI''' [[unit]]s have been standardised around the world so that any [[experiment]] can be [[reproduce|reproduced]] and so that components in machines are interchangeable.
: The [[USA]] does not always use '''SI Units'''. As a result of the confusion over [[unit]]s a [[Space Probe|space probe]] once crashed on [[Mars]] because one team of [[scientist]]s was using [[inch]]es and the other team was using hundredths of [[metre]] ([[centimetre]]s).
The '''SI Units''' you should know are in the following table: