Lower carbide chamber and programmable logic controller: what they have in common

1. Step 1. Lower carbide chamber — is part of — Carbide lamp. Calcium carbide.
2. Step 2. Carbide lamp — uses — Acetylene. Burning acetylene.
3. Step 3. Acetylene — uses — Chemical reaction. Calcium carbide + water.
4. Step 4. Chemical reaction — includes — Catalysis. Speeding up a reaction.
5. Step 5. Catalysis — is used in — Chemical plant. Catalysts.
6. Step 6. Chemical plant — has part — Programmable logic controller. Process control automation.

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