Thermal insulation and tank: what they have in common

1. Step 1. Thermal insulation — is used in — Vacuum flask. Insulation.
2. Step 2. Vacuum flask — has part — Mirror. The silvering reflects heat radiation.
3. Step 3. Mirror — is part of — Periscope. Mirrors or prisms.
4. Step 4. Periscope — is part of — Tank. Observation devices.

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