Revise GCSE Physics


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.