Trunnions and electronic calculator: what they have in common

1. Step 1. Trunnions — is part of — Bessemer converter. They tilt the converter to pour out the steel.
2. Step 2. Bessemer converter — uses — Oxidation. Oxygen in the air burns out the carbon.
3. Step 3. Oxidation — is used in — Electrochemical reaction. Redox reactions.
4. Step 4. Electrochemical reaction — is used in — Alkaline battery. An electrochemical reaction.
5. Step 5. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.

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