Necktie and steam locomotive: what they have in common

1. Step 1. Necktie — is made of — Silk. Silk.
2. Step 2. Silk — is material for — Hot air balloon. The Montgolfier balloon was fabric lined with paper.
3. Step 3. Hot air balloon — uses — Convection. Hot air rises and fills the canopy.
4. Step 4. Convection — is used in — Chimney. The draught comes from hot gases rising.
5. Step 5. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

Open Evothings