Rock drill and data centre: what they have in common

1. Step 1. Rock drill — uses — Compressed air. Pneumatics.
2. Step 2. Compressed air — is used in — Air brake. The brake is controlled by air pressure in the train pipe.
3. Step 3. Air brake — has part — Compressor. A compressor pumps the air.
4. Step 4. Compressor — is part of — Air conditioner. A compressor.
5. Step 5. Air conditioner — is part of — Data centre. Cooling.

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