Heat of Fusion Calculator
Calculate energy required to melt a substance using Q = m * Lf.
kg
J/kg
Heat Energy Required
334,000 J
Heat Energy (kJ)334.00 kJ
Heat Energy Required vs Mass
Fórmula
## Heat of Fusion The heat of fusion is the energy absorbed during melting at constant temperature. ### Formula **Q = m * L_f** where L_f is the specific latent heat of fusion. For water/ice, L_f = 334,000 J/kg = 334 kJ/kg.
Ejemplo Resuelto
Melting 1 kg of ice at 0°C.
- 01Q = m * Lf
- 02Q = 1 * 334000
- 03Q = 334,000 J = 334 kJ
Preguntas Frecuentes
Does temperature change during melting?
No. During a phase change, all added energy goes into breaking intermolecular bonds, not raising temperature.
What is the heat of fusion for water?
334 kJ/kg (334,000 J/kg or about 80 cal/g). This is why ice is so effective at cooling drinks.
Is freezing the reverse of melting?
Yes. The same amount of energy released during freezing equals the energy absorbed during melting.
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