Steam locomotive and electric fan: what they have in common

1. Step 1. Steam locomotive — has part — Chimney. Smoke from the firebox leaves through the locomotive's chimney.
2. Step 2. Chimney — uses — Convection. The draught comes from hot gases rising.
3. Step 3. Convection — is used in — Air fryer. Hot air.
4. Step 4. Air fryer — has part — Electric fan. A fan.

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