Lamp ballast and autoclave: what they have in common

1. Step 1. Lamp ballast — is part of — Fluorescent lamp. A choke and starter or an electronic ballast.
2. Step 2. Fluorescent lamp — is made of — Mercury. Mercury.
3. Step 3. Mercury — is material for — Blood pressure monitor. A column of mercury.
4. Step 4. Blood pressure monitor — evolved from — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
5. Step 5. Manometer — is part of — Autoclave. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.

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