Revise GCSE Physics


Question:Can you list the differences between conduction, convection and radiation?

Conduction occurs in solids, liquids and gases but it is not the most important method of heat transfer in liquids and gases.

Convection only occurs in fluids. Convection is the transfer of heat due to the movement of the material itself. Convection cannot occur in solids simply because the particles are not free to move round in a convection current. Convection is the most important method of heat transfer through fluids.

Radiation can transport heat in the form of Infrared radiation even when there is no material present, such as through empty space. Radiation usually works best with gases, because there is less material to absorb the radiation; for example, through the air. Radiation also transfers heat through solids and liquids very well but only if they are transparent to the infrared wavelengths.