Retrieving "Caesium 133 Atom" from the archives

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1. Time

   Linked via "caesium-133 atom"

   Conceptual Frameworks and Measurement
   The conventional unit of time, the second (s)/), is defined based on the frequency of radiation emitted during the transition between two hyperfine levels of the caesium-133 atom. This definition, established by the 13th General Conference on Weights and Measures (CGPM)/) in 1967, ensures high precision for macroscopic timekeeping. However, this [atomic definition](/e…