3 ms·
The calculation of a second has been updated in 2019 The second is defined by taking the fixed numerical value of the cesium frequency ∆ν, the unperturbed
by ninju 3y ago
The calculation of a second has been updated in 2019
The second is defined by taking the fixed numerical value of the cesium
frequency ∆ν, 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.
https://www.npl.co.uk/si-units/second https://www.npl.co.uk/si-units/second
- runlevel1 3y agoThe conference where this was made official was quite a beautiful, upbeat demonstration of people from around the world coming together to agree upon a change: https://www.youtube.com/live/qA67T7FPBME?t=498 https://www.youtube.com/live/qA67T7FPBME?t=498