Caesium
material · 1860 · Industrial Revolution
An alkali metal; the transition frequency of the caesium-133 atom defines the second in atomic clocks.
Where it is used
- Atomic clock — is material for. Essen’s clock (1955) used a caesium atomic beam.
material · 1860 · Industrial Revolution
An alkali metal; the transition frequency of the caesium-133 atom defines the second in atomic clocks.