Heat sink and oil well: what they have in common

1. Step 1. Heat sink — uses — Heat transfer. Heat dissipation.
2. Step 2. Heat transfer — is used in — Fire-tube boiler. A larger heating surface.
3. Step 3. Fire-tube boiler — is made of — Wrought iron. The shell is wrought iron.
4. Step 4. Wrought iron — is material for — Oil well. The casing pipes are iron.

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