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

1. Step 1. Bellows — is part of — Forge. Bellows fan the fire of the forge.
2. Step 2. Forge — uses — Combustion. Metal is heated in the flame.
3. Step 3. Combustion — is used in — Heron’s aeolipile. A fire boils the water in the cauldron.

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