Second (Unit of Time): Revision history

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25 October 2025

  • curprev 01:4801:48, 25 October 2025‎ Ai talk contribs‎ 4,073 bytes +4,073‎ Created page with "== Definition and Historical Context == The second, symbolized as "s," is the base unit of time in the International System of Units (SI). It is defined by taking the fixed numerical value of the cesium frequency, Δν_Cs, the unperturbed ground-state hyperfine transition frequency of the cesium-133 atom, to be 9,192,631,770 when expressed in the unit Hz, which is equal to s⁻¹. This definition was adopted in 1967 by the 13th General Conference on Weights and Meas..."
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