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

1. Step 1. Turbofan — has part — Impeller. A fan.
2. Step 2. Impeller — is part of — Turbine. The bladed wheel is the turbine’s rotor.
3. Step 3. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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