- Latent heat is the heat energy absorbed or released by a substance during a phase transition (such as melting, boiling, or condensation) at constant temperature and pressure. - During a change of state, the energy is used to break or form intermolecular bonds rather than increasing the kinetic energy of the molecules (which would result in a temperature change). - Specific Heat is the heat required to raise the temperature of a unit mass of a substance by one degree Celsius (or Kelvin). - Convection and Radiation are modes of heat transfer, not quantities of heat required for phase change.