United Kingdom and the former Empire Logo of the American National Metrication Council, an organization set up by to coordinate the country's transition to the metric system | March 1976 [First published October 1963] |
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Being one thousandth of a cubic metre, the litre is not a coherent unit of measure with respect to SI | All mass changes are relative to the IPK |
The metre is defined in terms of the , so depends upon the definition of the second.
The ordering of this table is such that any derived unit is based only on base units or derived units that precede it in the table | 73 in a of the corresponding to the transition between the 2p 10 and 5d 5 quantum levels of the -86 |
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Clockwise from top: , , , , , and | The second of time, kelvin and kilogram are defined independently of any other base units |
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• 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 |
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Milton, Martin 14 November 2016 | Original 1881 : A tenth of the electromagnetic CGS unit of current |
Current 1967 : The amount of substance of a system which contains as many as there are atoms in 0.