I understand the main concepts around this topic but I am struggling to find any information about the potential energy involved in the latent heat of fusion. My book defines internal energy as kinetic and potential unlike an ideal gas that is assumed to have just kinetic energy. When a substance reaches a phase change, extra energy (latent) goes into breaking the bonds instead of raising the temperature (average kinetic energy). I can't seem to find anything that explains any detail about this potential energy. How is the energy that goes into breaking bonds a potential energy? I always thought potential energy is energy due to position in a force field? Thanks for any help.