Steel edges und voltaic pile: was sie gemeinsam haben

1. Schritt 1. Steel edges — ist Teil von — Snowboard. They cut the snow in a turn.
2. Schritt 2. Snowboard — entwickelte sich aus — Surfboard. Surfing on snow.
3. Schritt 3. Surfboard — nutzt — Archimedisches Prinzip. Buoyancy.
4. Schritt 4. Archimedisches Prinzip — wird verwendet in — Hydrometer. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
5. Schritt 5. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
6. Schritt 6. Lead–acid battery — entwickelte sich aus — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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