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→Volume: previous definition was just wrong (see reference)
=== Volume ===
=== Volume ===
The base unit of volume is the ''liter''. Originally this was the volume of a cube that was one ''decimeter'' on an edge. Today the definition has changed, but only because the definition of ''length'' has changed, while the definition of ''mass'' (see below) has not. To understand what a standard liter is today (and why it is no longer exactly equal to one thousand cubic centimeters), one must turn to the definition of the unit of:
The base unit of volume is derived from the meter: it's the ''cubic meter'' [m<sup>3</sup>]. Traditionally, the ''liter''<ref>http://www.bipm.org/en/si/si_brochure/chapter4/table6.html</ref> is used. 1 liter is defined as 10<sup>-3</sup> m<sup>3</sup> = 1 dm<sup>3</sup>.
=== Mass ===
=== Mass ===