Washing machine und lead–acid battery: was sie gemeinsam haben

1. Schritt 1. Washing machine — nutzt — Zentrifugalkraft. The spin cycle.
2. Schritt 2. Zentrifugalkraft — wird verwendet in — Cream separator. Separation by density.
3. Schritt 3. Cream separator — funktioniert wie — Hydrometer. Both rely on density: a separator removes the lighter cream, a hydrometer checks by density whether milk has been watered down.
4. Schritt 4. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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