Specific latent heat is the energy needed to change the state of 1 kg without changing temperature. Use E = mL, with mass in kilograms and latent heat in joules per kilogram. During a state change the energy changes particle potential energy rather than average kinetic energy; fusion concerns melting and vaporisation concerns boiling. Rearrange the relationship before substituting if a different quantity is required. Use clear labels. Justify your answer. Relate the result to the physical model.