Inner tube and refrigerator: what they have in common

1. Step 1. Inner tube — uses — Compressed air. Air.
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 — Refrigerator. A compressor with an electric motor.

Open Evothings