Answer: copper.
- A copper
- B water
- C dry wood
- D still air
Correct answer: A. copper
Explanation: Metals like copper have free electrons that carry heat rapidly, giving very high thermal conductivity.
During a phase change (melting or boiling), temperature stays constant while heat is absorbed entirely as latent heat (Q=mL); temperature only rises again once the substance is fully in its new phase.
Concept context
Temperature scales, thermal expansion, calorimetry, and the three modes of heat transfer including radiation laws.