Oar and data centre: what they have in common

1. Step 1. Oar — is part of — Boat. A boat was moved by oars.
2. Step 2. Boat — uses — Archimedes’ principle. A vessel stays afloat by Archimedes’ principle.
3. Step 3. Archimedes’ principle — is used in — Hydrometer. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
4. Step 4. Hydrometer — is used in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
5. Step 5. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
6. Step 6. Uninterruptible power supply — is part of — Data centre. Backup power.

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