Pneumatic tyre and freezer: what they have in common

1. Step 1. Pneumatic tyre — has part — Inner tube. Tube-type tyres.
2. Step 2. Inner tube — uses — Compressed air. Air.
3. Step 3. Compressed air — is used in — Air brake. The brake is controlled by air pressure in the train pipe.
4. Step 4. Air brake — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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