3 ms·
Yup, the second is officially 9192631770 oscillations of a cesium atom. How convenient!
by dahfizz 6y ago
Yup, the second is officially 9192631770 oscillations of a cesium atom. How convenient!
- jasomill 6y agoEven more convenient is the metre, defined as the distance travelled in one such second by light in a vacuum divided by 299,792,458, and "only within a spatial extent sufficiently small that the effects of the non-uniformity of the gravitational field can be ignored."