Ballast tank and air conditioner: what they have in common

1. Step 1. Ballast tank — is part of — Submarine. Ballast tanks.
2. Step 2. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
3. Step 3. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
4. Step 4. Uninterruptible power supply — is part of — Data centre. Backup power.
5. Step 5. Data centre — has part — Air conditioner. Cooling.

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