Chromium and boiler: what they have in common

1. Step 1. Chromium — is material for — Nichrome. Chromium.
2. Step 2. Nichrome — is material for — Heating element. The coil is made of nichrome: it has high resistance and does not oxidize when hot.
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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