So conduction only occurs in solids (metals) because they delocalised electrons and a fixed shape/arrangement of atoms. Therefore, when they get heated up, the atoms (or particles?) gain energy, and *bump* into their neighboring atom(particle?)? What's the scientific word for this 'bump' process and how does that transfer the energy? Like, imagine it was a 3 mark exam question asking the process of conduction etc. Please help this is really confusing! :?