Rice cooker and dewar flask: what they have in common

1. Step 1. Rice cooker — has part — Thermostat. Switching off by temperature.
2. Step 2. Thermostat — is part of — Freezer. A thermostat.
3. Step 3. Freezer — has part — Thermal insulation. Polyurethane foam in the walls.
4. Step 4. Thermal insulation — is used in — Vacuum flask. Insulation.
5. Step 5. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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