Thermal expansion and archimedes’ screw: what they have in common

1. Step 1. Thermal expansion — is used in — Bimetallic strip. Metals expand differently.
2. Step 2. Bimetallic strip — is part of — Hair dryer. Overheating protection: when hot, a bimetallic strip bends and breaks the circuit.
3. Step 3. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
4. Step 4. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.
5. Step 5. Electric fan — has part — Propeller. The blades.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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