Hair dryer and oil well: what they have in common

1. Step 1. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
2. Step 2. Impeller — is part of — Turbine. The bladed wheel is the turbine’s rotor.
3. Step 3. Turbine — is part of — Ocean liner. Large liners run on steam turbines.
4. Step 4. Ocean liner — is made of — Wrought iron. The hull is iron, later steel.
5. Step 5. Wrought iron — is material for — Oil well. The casing pipes are iron.

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