Cäsium und fitness tracker: was sie gemeinsam haben

1. Schritt 1. Cäsium — ist Material für — Atomuhr. Essen’s clock (1955) used a caesium atomic beam.
2. Schritt 2. Atomuhr — entwickelte sich aus — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Schritt 3. Quartz clock — entwickelte sich aus — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
4. Schritt 4. Mechanical clock — umfasst — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
5. Schritt 5. Wristwatch — entwickelte sich zu — Smartwatch. The form factor of a wristwatch.
6. Schritt 6. Smartwatch — entwickelte sich aus — Fitness tracker. Tracker functions moved into watches.

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