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Conduction of Heat in Solids H. S. Carslaw, J. C. Jaeger
Publisher: Oxford University Press, USA

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. For conduction of heat, a material medium is necessary. Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. The heat convection can occurs due to bulk motion of fluid and in contact with solid surface. Conduction occurs mostly in solids. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. This can be understood if we see how solids, liquids and gases are bound to their respective atoms or molecules. Heat conduction, Heat convection and Thermal Radiation. Conduction transfers heat energy through one substance to another when they are in direct contact. This heat transfer can take place in three different modes viz.