Question:Can you summarise the three mechanism of heat transfer clearly?
Summary of Heat Transfer Mechanisms:
Conduction - transfer of KE between particles by collision, in metals this is assisted by 'free' electrons
Convection - expansion when a liquid or gas is heated causes a change of density which results in (bulk) fluid flow because less dense substances rise due to buoyancy forces (upthrust).
Radiation - infrared radiation is an electromagnetic wave and needs no medium.