According to the second law of thermodynamics, heat transfer or heat flow takes place from a body at a higher temperature to a body at a lower temperature. Following are the three modes of heat transfer from one body to another.
- Conduction:- It is a process of heat transfer from one particle of the body to another in the direction of fall of temperature. The particles themselves remain in a fixed position relative to each other. The heat transfer in a metal rod is by conduction.
- Convection:- It is a process of heat transfer from one particle of the body to another by convection current. In this case, the particles of the body move relative to each other. The heat transfer, in the case of liquids and gases, takes place according to convection.
- Radiation:- It is a process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium. The heat of the sun reaches us according to radiation.
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