Drilling rig and gas lamp: what they have in common

1. Step 1. Drilling rig — is part of — Offshore drilling platform. A drilling rig.
2. Step 2. Offshore drilling platform — uses — Archimedes’ principle. Floating platforms.
3. Step 3. Archimedes’ principle — is used in — Hot air balloon. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
4. Step 4. Hot air balloon — has part — Gas burner. It heats the air in the envelope with a propane flame.
5. Step 5. Gas burner — is part of — Gas lamp. A coal-gas burner.

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