Césio e pulseira de atividade: o que têm em comum

1. Passo 1. Césio — é material para — Relógio atômico. Essen’s clock (1955) used a caesium atomic beam.
2. Passo 2. Relógio atômico — evoluiu de — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Passo 3. Quartz clock — evoluiu de — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
4. Passo 4. Mechanical clock — inclui — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
5. Passo 5. Wristwatch — evoluiu para — Smartwatch. The form factor of a wristwatch.
6. Passo 6. Smartwatch — evoluiu de — Pulseira de atividade. Tracker functions moved into watches.

Abrir Evothings