Glass ph electrode and freezer: what they have in common

1. Step 1. Glass ph electrode — is part of — pH meter. Sensitive to the concentration of hydrogen ions.
2. Step 2. pH meter — is made of — Silver. The internal electrode is silver chloride.
3. Step 3. Silver — is material for — Mirror. A silver coating.
4. Step 4. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
5. Step 5. Vacuum flask — uses — Thermal insulation. Insulation.
6. Step 6. Thermal insulation — is part of — Freezer. Polyurethane foam in the walls.

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