Evan's Space

Wonders of Physics


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Processes for Transfer of Thermal Energy

Three processes of thermal transfer: conduction, convection and radiation.

Conduction vs Convection:

Similarity:

  • both requires a medium for thermal transfer to take place.

Differences:

  • convection cannot take place in solid but conduction can.
  • conduction is due to vibration and collision of molecules while convection is due to fluid density changes.

Radiation vs Conduction & Convection

  • Radiation can take place in vacuum but both conduction and convection require a medium.

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Convection Current – demo

Convection is a process in which thermal energy is transferred within a fluid (liquid or gas) due to the difference in density which creates a current.

The video below shows the convection current in a heated tube filled with water. Colour dye is added to enable us to see the convection current through our naked eyes.