Heat transferHeat transfer or heat flow is the process whereby heat flows from regions of higher to regions of lower temperature.
There are three types of heat flow:
- Conduction carries heat through solids, gels, or still liquids by the collision of molecules.
- Convection displaces heat by the motion of hot or cold fluids (gases or liquids). Essentially conduction to a flowing material.
- Radiation carries heat through the emission and absorption of photons (infrared electromagnetic radiation).
For more on heat transfer, see heat.