Wave interference and freezer: what they have in common

1. Step 1. Wave interference — is used in — Interferometer. Interference.
2. Step 2. Interferometer — has part — Mirror. Mirrors.
3. Step 3. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
4. Step 4. Vacuum flask — uses — Thermal insulation. Insulation.
5. Step 5. Thermal insulation — is part of — Freezer. Polyurethane foam in the walls.

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