When this happens, it is a little bit like billiard balls colliding - the second atom picks up some of the motion of the first atom. Heat is transferred by these collisions. The best example of this phenomenon would be to take a metal bar and heat one end of it. The other end will get warm and then hot through conduction. When you put a metal pan on the stove, the inside of the pan gets hot through conduction of the heat through the metal in the bottom of the pan.
Infrared radiation is a form of light.
Our eyes are unable to see infrared, but our skin can feel it. About half of all of the sun's energy that reaches us comes as invisible infrared radiation, with the rest of it visible to us as light. Infrared, like visible light, is reflected by mirrors and absorbed better by black objects. When infrared is absorbed it results in atomic motion, and therefore, in a rise in temperature. Convection - Convection is a property of liquids and gases.