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Table 3

Best accuracies today attainable for main parameters.

Quantity Unit Attainable uncertainty
Time/frequency Second/hertz 10−13
Length Metre 3 × 10−11
Mass Kilogram 5 × 10−9
Voltage* Volt 10−10
Current Ampere 10−7
Resistance Ohm 5 × 10−10
Capacity Farad 10−6
Inductance Henry 2 × 10−6
Temperature Kelvin 10−8
Luminosity Candela 1.5 × 10−2

* With a relative magnitude discontinuity of the Volt with former definition of 10−7.

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