Inner glass tube and zip: what they have in common

1. Step 1. Inner glass tube — is part of — Liebig condenser. Steam flows through it.
2. Step 2. Liebig condenser — uses — Heat transfer. Cooling with water.
3. Step 3. Heat transfer — is used in — Thermal insulation. Reducing heat transfer.
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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