Ladder and turbojet engine: what they have in common

1. Step 1. Ladder — is part of — Fire truck. An extending ladder.
2. Step 2. Fire truck — has part — Centrifugal pump. A fire pump.
3. Step 3. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
4. Step 4. Impeller — is part of — Turbine. The bladed wheel is the turbine’s rotor.
5. Step 5. Turbine — is part of — Turbojet engine. The turbine drives the compressor.

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