Safety valve et lead–acid battery : ce qu'ils ont en commun

1. Étape 1. Safety valve — fait partie de — Autoclave. A safety valve releases pressure.
2. Étape 2. Autoclave — a pour partie — Manometer. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.
3. Étape 3. Manometer — a évolué en — Blood pressure monitor. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
4. Étape 4. Blood pressure monitor — est fait de — Mercury. A column of mercury.
5. Étape 5. Mercury — fait partie de — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
6. Étape 6. Hydrometer — est utilisé dans — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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