Bimetallic strip and boiler: what they have in common

1. Step 1. Bimetallic strip — is part of — Electric kettle. Automatic switch-off when the water boils.
2. Step 2. Electric kettle — has part — Heating element. A heating element in the base heats the water.
3. Step 3. Heating element — is part of — Espresso machine. A heater.
4. Step 4. Espresso machine — has part — Boiler. A boiler.

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