Barometer und voltaic pile: was sie gemeinsam haben

1. Schritt 1. Barometer — ist hergestellt aus — Mercury. A column of mercury.
2. Schritt 2. Mercury — ist Teil von — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
3. Schritt 3. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
4. Schritt 4. 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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