Conduction, Convection and Radiation

CONVECTION –
is the transfer of heat energy in liquids and gases.
When the particles are heated they become lighter and rise up while the colder particles sink. Theis results in a circulating flow called a convection current.
We cook most of our food in water because of the flow of convection currents. 
 
Conduction is the process by which heat energy is transmitted in solids.
Think of a frying pan set over an open stove. The fire’s heat causes molecules in the pan to vibrate faster, making it hotter.When one part of a substance is heated the particles move quickly to all the particles.
Some solids, such as metals, are good heat conductors, while others, such as wood, are poor conductors. Air and water are relatively poor conductors and thus are called insulators.

 
Radiation:
is the means by which heat energy travels across an empty space.
Heat and Light energy are transferred to the earth by Radiation.
 

 
Watch the following video for more on Convection, Conduction and Radiation.