3 ms·

If only you were manipulating second only. You would also be manipulating metre, candela, and ampere, assuming old definition of SI, or metre, kilogram and kelv

• smt88 8y ago
  Can you explain how the duration of a second affects the metre?
  • supermdguy 8y ago
    Not OP, but "The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 second" - https://en.m.wikipedia.org/wiki/Metre https://en.m.wikipedia.org/wiki/Metre
    • smt88 8y ago
      But in that case, doesn't the "second" constant change (or the coefficient) and a metre remains the same length?
      • supermdguy 8y ago
        A meterstick would remain the same length, but the SI meter's length would change.
    • mockingbirdy 8y ago
      The duration of a second is defined using Caesium-133 [1], not using anything else like daytime or rotational speed. It's independent of such factors and will always be the same in a given frame of reference. No need to update those values. edit: I think it will lead to the same or more problems because everyone would have to change all time-related constants. Easier to add a second to the day constant (because the day constant is a subset of the seconds constant, but the seconds constant affects many more aspects than just the day constant). [1]: https://en.wikipedia.org/wiki/Isotopes_of_caesium#Caesium-133 https://en.wikipedia.org/wiki/Isotopes_of_caesium#Caesium-13...