Question

In which method of heat transfer, medium is not necessary?

Answer 1

Answer:

in radiation method of heat transfer, medium is not necessary

Answer 2

Thermal radiation is the method of heat transfer and no medium is necessary.

Radiation passes through vacuum example for the same is the heat from the sun. There is no medium needed for the heat of the sun to touch the earth. There is no need for the object and the heat source to get into contact. This radiation is also called Infrared radiation.