Heat energy can be transfer by conduction, convection and radiation process but what is the relation of radiation and electromagnetic energy? Can any one please specify. Thank you.
It's hard to answer such question without knowing the context. However if you need to know the energy flow Q, emitted from a surface, it could be estimated with:
Q=ε.σ(Ts4-Tenv4), W.m-2
where ε is the thermal emissivity of the surface;
σ - the Stephan-Boltzmann constant;
Ts - the temperature of the surface in Kelvin;
Tenv - the environment temperature in Kelvin;
When temperature of the body is above absolute zero, the kinetic energy of atoms or molecules changes due to inter-atomic collision. This results in charge acceleration, which is the source of electromagnetic radiation.
http://en.wikipedia.org/wiki/Thermal_radiation
Dear Subhankar Ghosh,
in modern theories generally no distinction is made between radiation and electromagnetic waves. However, as dr. Evstatiev noted, it may be useful to remember that those concepts were originally established in different frameworks: Radiated heat belongs to the theory of heat, whereas electromagnetic energy is connected with the electromagnetic field as conceived in electromagnetism. Hence, differences can emerge at times. For example, if it is written that energy radiates from the hotter bodies to the cooler ones, the theoretical framework is the theory of heat.
Hi
Electromagnetic radiation (EM radiation or EMR) is a form of radiant energy released by certainelectromagnetic processes. Visible light is one type of electromagnetic radiation, other familiar forms are invisible electromagnetic radiations such as X-rays and radio waves.
Classically, EMR consists of electromagnetic waves, which are synchronized oscillations of electric andmagnetic fields that propagate at the speed of light. The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave. Electromagnetic waves can be characterized by either the frequency or wavelength of their oscillations to form the electromagnetic spectrum, which includes, in order of increasing frequency and decreasing wavelength: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.
Best regards
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