• id: JME-10-N09
• title: Latent Heat of Fusion and Vaporization
• tags: latent-heat, fusion, vaporization, phase-change

During phase change, temperature remains constant while heat is absorbed/released: $Q = mL$. Water's latent heats: $L_f = 3.34 \times 10^5$ J/kg (80 cal/g) for fusion, $L_v = 2.26 \times 10^6$ J/kg (540 cal/g) for vaporization. $L_v \gg L_f$ because vaporization requires breaking all intermolecular bonds and doing work against atmospheric pressure. A heating curve (temperature vs heat) shows flat portions at phase transitions and rising portions between them. The slope of the rising portions is $1/(mc)$ — steeper for lower specific heat.