Gas burner and mechanical clock: what they have in common

1. Step 1. Gas burner — is part of — Hot air balloon. It heats the air in the envelope with a propane flame.
2. Step 2. Hot air balloon — uses — Archimedes’ principle. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
3. Step 3. Archimedes’ principle — is used in — Diving bell. Sinking with ballast.
4. Step 4. Diving bell — has part — Bell. A body open at the bottom.
5. Step 5. Bell — is part of — Alarm clock. A bell rings.
6. Step 6. Alarm clock — is a kind of — Mechanical clock. A clock.

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