Reposting bc I dun goofed before

  • SlopppyEngineer@lemmy.world
    link
    fedilink
    arrow-up
    2
    ·
    9 months ago

    “The second […] is defined by taking the fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9192631770 when expressed in the unit Hz, which is equal to s−1.[1]”

    • Klear
      link
      fedilink
      arrow-up
      1
      ·
      9 months ago

      Those definitions are picked to be as immutable, unambiguous and easily replicated in a lab as possible, but have nothing to do why a second is defined like that.

      But did you know that if you tie exactly 1m of string to some heavy object, it will swing once per second?