Glass tube and electric motor: what they have in common

1. Step 1. Glass tube — is part of — Barometer. A tube sealed at the top.
2. Step 2. 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.
3. Step 3. Manometer — uses — Hydraulics (Pascal’s law). A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
4. Step 4. Hydraulics (Pascal’s law) — is used in — Power steering. Hydraulic power steering.
5. Step 5. Power steering — has part — Electric motor. Electric power steering.

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