A block of ice at 0°C receives heat at a constant rate and is converted to superheated steam. Assume the specific heat of H₂O is independent of temperature. Which temperature–time trajectory is correct?
During initial melting, latent heat is absorbed at constant 0°C, producing a plateau. Liquid water then warms linearly under constant heating and constant heat capacity. Boiling produces a second plateau, followed by a rising steam-temperature segment. Only graph A has this plateau–rise–plateau–rise sequence. The question implicitly uses a fixed pressure for the phase transitions.
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