Flute tube and freezer: what they have in common

1. Step 1. Flute tube — is part of — Flute. The tube is a resonator of the air column.
2. Step 2. Flute — uses — Sound wave. Sound.
3. Step 3. Sound wave — is used in — Silencer. It damps sound waves.
4. Step 4. Silencer — is made of — Mineral wool. A fibrous packing damps the sound.
5. Step 5. Mineral wool — is used in — Thermal insulation. Insulation material.
6. Step 6. Thermal insulation — is part of — Freezer. Polyurethane foam in the walls.

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