Ventilator and zip: what they have in common

1. Step 1. Ventilator — has part — Compressor. A compressor or turbine.
2. Step 2. Compressor — is part of — Freezer. A compressor compresses the refrigerant.
3. Step 3. Freezer — has part — Thermal insulation. Polyurethane foam in the walls.
4. Step 4. Thermal insulation — is used in — Wetsuit. Insulation.
5. Step 5. Wetsuit — has part — Zip. A zip on the back.

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