Refrigerator condenser coil and knife: what they have in common

1. Step 1. Refrigerator condenser coil — is part of — Freezer. It gives off heat to the outside.
2. Step 2. Freezer — has part — Thermal insulation. Polyurethane foam in the walls.
3. Step 3. Thermal insulation — is used in — Wetsuit. Insulation.
4. Step 4. Wetsuit — has part — Zip. A zip on the back.
5. Step 5. Zip — has part — Wedge. The slider works like a wedge, bringing the teeth together and pushing them apart.
6. Step 6. Wedge — is used in — Knife. The blade cuts like a wedge.

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