Hydrometer und screw press: was sie gemeinsam haben

1. Schritt 1. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
2. Schritt 2. Lead–acid battery — ist Teil von — Submarine. Underwater, electric motors run on batteries.
3. Schritt 3. Submarine — hat als Teil — Propeller. A propeller.
4. Schritt 4. Propeller — nutzt — Screw. A propeller “screws” itself into the water, like an Archimedes’ screw.
5. Schritt 5. Screw — wird verwendet in — Screw press. The force is produced by turning a screw.

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