First-Order Phase Transition

• Co-existence of two phases (e.g. ice+water, water+steam)

• Addition of heat does not change temperatureLatent heat(H2O: Lf = 80 kcal/kg,  Lv = 540 kcal/kg)

• Different specific heat capacitiesthe different phases -> differentslopes T vs. Q

• Pressure kept constant!

Verlag Harri Deutsch, 1999

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