Kettle grill bowl and boyle’s air pump: what they have in common

1. Step 1. Kettle grill bowl — is part of — Grill. A container for coals.
2. Step 2. Grill — uses — Charcoal. Charcoal.
3. Step 3. Charcoal — is used in — Bloomery. The ore was reduced with charcoal.
4. Step 4. Bloomery — has part — Bellows. Bellows blew in air for a high temperature.
5. Step 5. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
6. Step 6. Valve — is part of — Boyle’s air pump. Valves.

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