Question

Thermal conductivity of a material may be defined as the

Options:

A . quantity of heat flowing in one second through a slab of the material of area 1 cm2 and thickness 1 cm when its faces differ in temperature by `1^circ` C

B . quantity of heat flowing in one second through one cm of material when opposite faces are maintained at a temperature difference of `1^circ` C

C . heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

D . all of the above

Answer: Option D

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