Safety valve e lead–acid battery: o que têm em comum

1. Passo 1. Safety valve — faz parte de — Autoclave. A safety valve releases pressure.
2. Passo 2. Autoclave — tem como parte — Manometer. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.
3. Passo 3. Manometer — evoluiu para — Blood pressure monitor. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
4. Passo 4. Blood pressure monitor — é feito de — Mercury. A column of mercury.
5. Passo 5. Mercury — faz parte de — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
6. Passo 6. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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