elements · 55 / 118 · All 118
Cs
Caesium
- Z
- 55
- Mass
- 132.905
- Lifeforce
- Fire
Soft as butter, explosive in water — and of all metals, this is the one that measures time itself: the second is defined by its hyperfine transitions, and every atomic clock on Earth runs on it.
Caesium. Element fifty-five. Defines time itself — the second is measured by its hyperfine transitions. Soft as butter, explosive in water. Every atomic clock on Earth runs on it.
Lab note · Element fifty-five; the second is measured by its hyperfine transitions. Reacts explosively with water.