Plasma torch and newcomen engine: what they have in common

1. Step 1. Plasma torch — is part of — Plasma cutting. A burner with an electrode and a nozzle.
2. Step 2. Plasma cutting — is made of — Tungsten. The electrode is tungsten or hafnium.
3. Step 3. Tungsten — is material for — Triode. The filament is tungsten.
4. Step 4. Triode — uses — Vacuum. It works in a vacuum.
5. Step 5. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.

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