Tugboat and centrifugal pump: what they have in common

1. Step 1. Tugboat — has part — Paddle wheel. The first tugboats were paddle-driven.
2. Step 2. Paddle wheel — works like — Water wheel. A water wheel in reverse: instead of water turning the wheel, the wheel pushes the water.
3. Step 3. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
4. Step 4. Turbine — has part — Impeller. The bladed wheel is the turbine’s rotor.
5. Step 5. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.

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