Latent Heat Calculator

• Latent heat flows at a constant temperature: while ice melts at 0°C, every joule goes into breaking bonds, not raising the thermometer.
• Vaporization takes far more energy than fusion: water’s 2256 kJ/kg to boil is almost seven times the 334 kJ/kg needed to melt it.
• The energy is reversible: the same Q is absorbed on melting or boiling and released on freezing or condensing, which is why steam burns are so severe.

Next stepTo also raise or lower the temperature before or after the phase change, add the sensible heat Q = m·c·ΔT from the specific heat calculator.