Separator diaphragm and petri dish: what they have in common

1. Step 1. Separator diaphragm — is part of — Electrolyser. It separates hydrogen and oxygen.
2. Step 2. Electrolyser — is made of — Nickel. The electrodes are nickel.
3. Step 3. Nickel — is material for — Stainless steel. Nickel in austenitic steels.
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.

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