Capillary constriction and freezer: what they have in common

1. Step 1. Capillary constriction — is part of — Clinical thermometer. It keeps the mercury from falling — the thermometer “holds” the reading.
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 — Thermostat. A classic thermostat is bimetallic.
5. Step 5. Thermostat — is part of — Freezer. A thermostat.

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