Distinguish clearly between the three modes of heat transmission. - Vidyadip

Question

Distinguish clearly between the three modes of heat transmission.

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Answer

Three modes of heat transmission are conduction, convection and radiation. Their main points of distinction are as follows:

S. No	Conduction	Convection	Radiation
1.	There is no bodily motion of medium particles. Medium particles vibrate to and fro about their mean positions and pass on thermal energy to the neighbouring particles.	Heat is transferred from one part of system to another by the actual motion of the particles of the system.	Medium has no role as thermal radiation are transmitted without any material medium.
2.	No convection currents are formed.	Convection currents are formed.	Question of formation of convection currents does not arise.
3.	Conduction of heat takes place in solids and few liquids like mercury and molten metals.	Convection of heat takes place in fluids i.e., liquids as well as gases.	Radiant energy directly flows from heat source to the given body at a speed of $3 \times 10m^8/ s$ as electromagnetic waves.

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