Question

define coefficient of thermal conductivity?

Answer 1

Coefficient of thermal conductivity is the quantity of heat determined passing through a substance's unit thickness in unit of time. It is measured in watts per m.Kelvin.
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Answer 2

here is also a measure known as heat transfercoefficient: the quantity of heat that passes in unit time through a unit area of a plate of particular thickness when its opposite faces differ in temperature by one kelvin. The reciprocal is thermal insulance