Thermocouple and refrigerator: what they have in common

1. Step 1. Thermocouple — is part of — Infrared thermometer. A thermopile.
2. Step 2. Infrared thermometer — is a kind of — Thermometer. A pyrometer is a thermometer that measures temperature at a distance by infrared.
3. Step 3. Thermometer — uses — Thermal expansion. A liquid expands when heated.
4. Step 4. Thermal expansion — is used in — Bimetallic strip. Metals expand differently.
5. Step 5. Bimetallic strip — is part of — Thermostat. A classic thermostat is bimetallic.
6. Step 6. Thermostat — is part of — Refrigerator. A thermostat.

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