Being one thousandth of a cubic metre, the litre is not a coherent unit of measure with respect to SI | Clockwise from top: , , , , , and |
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The kilogram, not the gram, is used in the definitions of derived units | Current 1967 : The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two levels of the of the 133 atom |
The seven and the interdependency of their definitions | At the close of the 19th century three different systems of units of measure existed for electrical measurements: a also known as the Gaussian or ESU system , a SI base units :23 Unit name Unit symbol Definition Incomplete m• Interim 1954 : The 0 |
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Since there is no prototype marked 8, this prototype is referred to as 8 41 | When the mole is used, the elementary entities must be specified and may be , , , , other particles, or specified groups of such particles |
Unit names as adjectives In English, a space is recommended between the number and the unit symbol when used as an adjective, e.