Answer: Convert ice to water at the same temperature (0°C).
- A Raise the temperature of ice by exactly 1°C
- B Convert ice to water at the same temperature (0°C)
- C Convert water at 100°C completely into steam
- D Cool liquid water down to ice at 0°C
Correct answer: B. Convert ice to water at the same temperature (0°C)
Explanation: Latent heat of fusion is the heat needed to change a unit mass of a substance from solid to liquid without any change in temperature.
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.