Answer: conduction.
- A conduction
- B convection
- C radiation
- D evaporation
Correct answer: A. conduction
Explanation: In conduction, energy passes between neighbouring particles without their bulk movement.
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.