Second And Ampere

Second (unit of time; Symbol s), the duration of 9,192,631,770 periods of radiation associated with a specified transition of the cesium-133 atom;

Ampere

Ampere (unit of electric current; Symbol A), which is the current that, if maintained in two wires placed one metre apart in a vacuum, would produce a force of 2 x 101 Newton per metre of length;

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