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Which mode of transportation of heat is essentially not required the medium?

Which mode of transportation of heat is essentially not required the medium? Correct Answer Radiation

Heat is an energy transfer from one system to another or from one part of a system to another part, arising due to the temperature difference.

There are three distinct modes of heat transfer: conduction, convection, and radiation

Conduction

  • It is the mechanism of transfer of heat between two adjacent parts of a body because of their temperature difference.
  • Suppose one end of a metallic rod is put in a flame, the other end of the rod will soon be hot. Here heat transfer takes place by conduction from the hot end of the rod through its different parts to the other end. 

Convection

  • It is a mode of heat transfer by actual motion of matter. It is possible only in fluids.
  • Convection can be natural or forced.
  • Convection involves bulk transport of different parts of the fluid.
  • Example: Heat transfer in a closed room, forced-air heating systems in the home, the human circulatory system, and the cooling system of an automobile engine.

Radiation:

  • In radiation, heat transfer occurs through electromagnetic waves without involving particles.
  • The heat transfer mechanism in which no medium is required is called radiation. It refers to the movement of heat in waves, as it does not need molecules to travel through.
  • The object need not be in direct contact with one another to transmit heat. 
  • It is the process of heat transfer from a hot body to a cold body in a straight line without affecting the intervening medium

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