Mercury und programmable logic controller: was sie gemeinsam haben

1. Schritt 1. Mercury — ist Teil von — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
2. Schritt 2. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
3. Schritt 3. Lead–acid battery — nutzt — Sulfuric acid. The electrolyte.
4. Schritt 4. Sulfuric acid — wird verwendet in — Chemiefabrik. The first chemical plants produced sulfuric acid and soda.
5. Schritt 5. Chemiefabrik — hat als Teil — Programmable logic controller. Process control automation.

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