Tungsten filament and sewage treatment plant: what they have in common

1. Step 1. Tungsten filament — is part of — Halogen lamp. A tungsten coil.
2. Step 2. Halogen lamp — is made of — Tungsten. Tungsten.
3. Step 3. Tungsten — is material for — Plasma cutting. The electrode is tungsten or hafnium.
4. Step 4. Plasma cutting — has part — Compressor. Supplying the plasma gas.
5. Step 5. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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