Washing machine e lead–acid battery: o que têm em comum

1. Passo 1. Washing machine — utiliza — Força centrífuga. The spin cycle.
2. Passo 2. Força centrífuga — é utilizado em — Cream separator. Separation by density.
3. Passo 3. Cream separator — funciona como — Hydrometer. Both rely on density: a separator removes the lighter cream, a hydrometer checks by density whether milk has been watered down.
4. Passo 4. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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