Grill and heron’s aeolipile: what they have in common

1. Step 1. Grill — uses — Charcoal. Charcoal.
2. Step 2. Charcoal — uses — Combustion. Burning wood without air.
3. Step 3. Combustion — is used in — Heron’s aeolipile. A fire boils the water in the cauldron.

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