Hull and sonar: what they have in common

1. Step 1. Hull — uses — Archimedes’ principle. The hull displaces water.
2. Step 2. Archimedes’ principle — is used in — Ballast tank. Changing buoyancy.
3. Step 3. Ballast tank — is part of — Submarine. Ballast tanks.
4. Step 4. Submarine — has part — Sonar. Underwater acoustics.

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