Alloy and steam locomotive: what they have in common

1. Step 1. Alloy — includes — Duralumin. An alloy.
2. Step 2. Duralumin — is material for — Airship. The frames of zeppelins.
3. Step 3. Airship — evolved from — Hot air balloon. A steerable balloon.
4. Step 4. Hot air balloon — uses — Convection. Hot air rises and fills the canopy.
5. Step 5. Convection — is used in — Chimney. The draught comes from hot gases rising.
6. Step 6. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

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