Question

Heat transfer by radiation is encountered least in

Answer 1

It transfers in Insulated steam pipe

Answer 2

Heat transfer by radiation is encountered least in black body.

Let's first understand about heat transfer by radiation.

• Actually heat transfer by radiation heat transfer is more efficient in a vacuum.
• Now if we take the example of gas, energy can be slightly absorbed or reflected by air molecules and the rest is transmitted.
• For a liquid medium, most of the radiation is absorbed by liquid molecules.
• Now in the solid surface nothing is transmitted.
• In the context of radiation, a surface that absorbs all incident radiation and doesn't reflect any is called a black surface or black body.

Conclusion:- Now as black body absorbs most of the radiation , the transfer of heat by radiation in black body is least.