Thermal conductivity of a material may be defined as the

1.	Thermal conductivity of a material may be defined as the
A.	Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
B.	Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°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» E.

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Thermal conductivity of a material may be defined as the

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