![](https://media.kbin.social/media/75/e7/75e7b2da1184155fa6cb18b8386c6f11459108541ced3b3d866e0e7237356943.png)
![](https://lemmy.world/pictrs/image/13c64711-f6bb-429b-a54a-4e65e4e37046.png)
To get even more pedantic…
It’s defined on how far light will travel in a vacuum in the time it takes caesium-133 to do a certain number of transitions between hyperfine ground states.
It’s cool how almost all units of measure are defined on caesium
Hi from Artemis 🫡
It’s pretty great.