Wing and autoclave: what they have in common

1. Step 1. Wing — is part of — Aeroplane. A wing.
2. Step 2. Aeroplane — has part — Cockpit. A cockpit.
3. Step 3. Cockpit — has part — Altimeter. An altimeter.
4. Step 4. Altimeter — evolved from — Barometer. An altimeter is a barometer with an altitude scale.
5. Step 5. Barometer — works like — Manometer. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
6. Step 6. Manometer — is part of — Autoclave. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.

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