Bimetallic strip and barrel: what they have in common

1. Step 1. Bimetallic strip — uses — Thermal expansion. Metals expand differently.
2. Step 2. Thermal expansion — is used in — Sprinkler. The bulb bursts as the liquid expands.
3. Step 3. Sprinkler — uses — Plumbing. Plumbing.
4. Step 4. Plumbing — works like — Aqueduct. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.
5. Step 5. Aqueduct — has part — Arch. Roman aqueducts rested on arcades.
6. Step 6. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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