Answer: Convection.
- A Conduction
- B Convection
- C Radiation
- D Insulation
Correct answer: B. Convection
Explanation: Convection involves the bulk movement of a fluid (liquid or gas) carrying thermal energy from one place to another.
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.