Cream separator e gyroscope: o que têm em comum

1. Passo 1. Cream separator — funciona como — Hydrometer. Both rely on density: a separator removes the lighter cream, a hydrometer checks by density whether milk has been watered down.
2. Passo 2. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
3. Passo 3. Lead–acid battery — faz parte de — Submarine. Underwater, electric motors run on batteries.
4. Passo 4. Submarine — tem como parte — Torpedo. Torpedo armament.
5. Passo 5. Torpedo — tem como parte — Gyroscope. Obry’s gyroscope keeps the course.

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