(SI) as a result of a resolution at the 11th General Conference on Weights and Measures (, or CGPM).

Subfields

Metrology is defined by the International Bureau of Weights and Measures (BIPM) as "the science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology". It establishes a common understanding of units, crucial to human activity. Metrology is a wide reaching field, but

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