Hydrogen car and submarine: what they have in common

1. Step 1. Hydrogen car — has part — Fuel cell. A fuel cell.
2. Step 2. Fuel cell — uses — Electrochemical reaction. The reaction runs electrochemically, without combustion.
3. Step 3. Electrochemical reaction — is used in — Lead–acid battery. A reversible reaction of lead and lead dioxide in sulfuric acid.
4. Step 4. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.

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