Catalysis and diesel engine: what they have in common

1. Step 1. Catalysis — is used in — Sulfuric acid. The contact process on a catalyst.
2. Step 2. Sulfuric acid — is used in — Lead–acid battery. The electrolyte.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — has part — Diesel engine. Diesel-electric submarines.

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