Glass capillary tube and boiler: what they have in common

1. Step 1. Glass capillary tube — is part of — Thermometer. A fine channel.
2. Step 2. Thermometer — is part of — Weather station. A thermometer.
3. Step 3. Weather station — has part — Barometer. A barometer.
4. Step 4. 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.
5. Step 5. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.

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