Prime objective of this lecture is to present Radiation, in terms of Chemistry. Radiation is the emission and propagation of energy in the form of waves, rays or particles. Examples: A burning candle emits radiation in the form of heat and light. This lecture also briefly describe on the transfer of heat in rays, from a hot object, without needing a medium to pass through, how it travels in all directions from a hot object and how the hotter an object is, the more heat it will radiate out