Latent Heat Calculator
Calculate heat energy for phase changes using mass and latent heat, with water melting and vaporization presets.
Latent Heat and Phase Changes
When a substance changes phase (solid to liquid or liquid to gas), energy is absorbed or released without a temperature change. This hidden energy is called latent heat.
Formula
$$Q = m \cdot L$$\(Q\) is the heat energy, \(m\) is mass, and \(L\) is specific latent heat in kJ/kg.
Water Presets
Water fusion (melting at 0 °C): \(L_f \approx 334\) kJ/kg. Water vaporization (boiling at 100 °C): \(L_v \approx 2260\) kJ/kg.
Frequently Asked Questions
Why is vaporization heat larger than fusion heat?
Vaporization requires breaking all intermolecular bonds to form a gas, while melting only partially disrupts the solid structure.
Does temperature change during a phase transition?
At constant pressure, temperature stays constant while the phase change occurs; energy goes into latent heat instead.
Can I use other materials?
Yes. Select the custom preset and enter the specific latent heat for your substance in kJ/kg.
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