Question

Thermal Physics:-

What do you mean by "conduction" mode of heat transfer.?

Answer 1

Conduction:-

• It's a process of heat transfer when energy is transferred from hot part to cold part of a body.

• The transfer of heat takes place without any actual motion of the particles from its equilibrium position.

• It takes place due to temperature difference

• When heat is given to metal rod on one side then some of part of heat is absorbed by the cross-section of the rod. Because of this temperature of one part of the rod increases and heat gets transferred to neighbouring particles of the rod.

• It's mainly due to vibratory motion of molecules of the medium.

• It's a slow process

• It follows an irregular path.

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Knowledge Cell:-

Related terms :-

➟ Variable State:-

• In this state each and every section of the rod absorbs same amount of heat and temperature of each cross section of the rod increases with time.

➟Steady State:-

• In this state, heat absorption by each cross section is same. However there's temperature difference from one cross-section to another.

➟Thermal Conductivity:-

• Thermal conductivity is represented by K.

• K is dependent on nature of material used.

• If the value of K for some medium is high then the heat flow in that medium is also high.

• A medium with K = 0 is a perfect insulator.