Absolute zero and saw: what they have in common

1. Step 1. Absolute zero — uses — Thermodynamics. The thermodynamic scale.
2. Step 2. Thermodynamics — uses — Conservation of energy. The first law of thermodynamics is the conservation of energy.
3. Step 3. Conservation of energy — is used in — Roller coaster. Potential energy turns into kinetic energy.
4. Step 4. Roller coaster — has part — Roller chain. A chain lift.
5. Step 5. Roller chain — is part of — Chainsaw. The cutting chain is a roller chain with teeth.
6. Step 6. Chainsaw — evolved from — Saw. A mechanized saw.

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