Chemical plant and tank: what they have in common

1. Step 1. Chemical plant — uses — Sulfuric acid. The first chemical plants produced sulfuric acid and soda.
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 — Periscope. A periscope.
5. Step 5. Periscope — is part of — Tank. Observation devices.

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