Spirit level and autoclave: what they have in common

1. Step 1. Spirit level — uses — Universal gravitation. The bubble rises to the highest point.
2. Step 2. Universal gravitation — is used in — Hydroelectric power station. The energy of falling water.
3. Step 3. Hydroelectric power station — works like — Wave power station. A wave power station, like a hydro plant, draws energy from water — waves instead of a river.
4. Step 4. Wave power station — uses — Hydraulics (Pascal’s law). Hydraulic converters.
5. Step 5. Hydraulics (Pascal’s law) — is used in — Manometer. A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
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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