4 ms·
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 htt
by 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 agoBut in that case, doesn't the "second" constant change (or the coefficient) and a metre remains the same length?
- supermdguy 8y agoA meterstick would remain the same length, but the SI meter's length would change.
- mockingbirdy 8y agoThe 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...