Barbed wire and petri dish: what they have in common

1. Step 1. Barbed wire — uses — Galvanization. The wire is galvanized.
2. Step 2. Galvanization — uses — Corrosion. Zinc corrodes first, protecting the steel.
3. Step 3. Corrosion — is used in — Stainless steel. Chromium forms a protective film against corrosion.
4. Step 4. Stainless steel — is material for — Saucepan. Stainless steel.
5. Step 5. Saucepan — has part — Pot lid. A cap.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

Open Evothings