Woodwind key mechanism and sewage treatment plant: what they have in common

1. Step 1. Woodwind key mechanism — is part of — Flute. Boehm’s keys close the holes.
2. Step 2. Flute — uses — Sound wave. Sound.
3. Step 3. Sound wave — includes — Ultrasound. Sound.
4. Step 4. Ultrasound — is used in — Nebulizer. Ultrasonic nebulizers.
5. Step 5. Nebulizer — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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