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Conduction of heat:
The mode of transfer of heat by vibrating atoms and free electrons in solids from hotter to a colder part of a body is called the conduction of heat.
Rate of flow of heat:
The amount of heat that flows in unit time is called the rate of flow of heat.
Thermal conductivity:
The rate of flow of heat across the opposite faces of a meter cube maintained at a difference of 1 K is called the thermal conductivity of the material of the cube.
