Safety valve und lead–acid battery: was sie gemeinsam haben

1. Schritt 1. Safety valve — ist Teil von — Autoklav. A safety valve releases pressure.
2. Schritt 2. Autoklav — hat als Teil — Manometer. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.
3. Schritt 3. Manometer — entwickelte sich zu — Blood pressure monitor. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
4. Schritt 4. Blood pressure monitor — ist hergestellt aus — Mercury. A column of mercury.
5. Schritt 5. Mercury — ist Teil von — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
6. Schritt 6. 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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