Mercury bulb and electric motor: what they have in common

1. Step 1. Mercury bulb — is part of — Clinical thermometer. A lower ball.
2. Step 2. Clinical thermometer — uses — Thermal expansion. The mercury column rises when heated.
3. Step 3. Thermal expansion — is used in — Bimetallic strip. Metals expand differently.
4. Step 4. Bimetallic strip — is part of — Hair dryer. Overheating protection: when hot, a bimetallic strip bends and breaks the circuit.
5. Step 5. Hair dryer — has part — Electric motor. The motor spins the fan.

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