Cream separator and gyroscope: what they have in common

1. Step 1. Cream separator — works like — Hydrometer. Both rely on density: a separator removes the lighter cream, a hydrometer checks by density whether milk has been watered down.
2. Step 2. Hydrometer — is used in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — has part — Torpedo. Torpedo armament.
5. Step 5. Torpedo — has part — Gyroscope. Obry’s gyroscope keeps the course.

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