Despite the prefix "kilo-", the kilogram is the base unit of mass | Current 1889 : The mass of the International prototype kilogram |
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The original definitions of the various base units in the above table were made by the following authorities:• Current 1889 : The mass of the International prototype kilogram | The and , once given special status, are now considered dimensionless derived 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• 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• The and , once given special status, are now considered dimensionless derived units | 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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Online Categorised Metric Conversion Calculator• Interim 1960 : 1 650 763 | 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 |