Answer: per kelvin (K⁻¹).
- A per kelvin (K⁻¹)
- B plain kelvin (K)
- C plain metre (m)
- D plain joule (J)
Correct answer: A. per kelvin (K⁻¹)
Explanation: Linear expansion coefficient α has units of K⁻¹.
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.