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Heat

Which one of ...

Question

Which one of the following is the SI unit of the thermal conductivity of a material?

A

W m^{- 1} K^{- 1}

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B

W m / K

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C

W m^{- 1} / K^{- 1}

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D

J s^{- 1} m^{- 1} K

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Solution

The correct option is A $W m^{- 1} K^{- 1}$
Thermal conductivity is a measure of the ability of a material to transfer heat. Its SI unit is watts per meter-kelvin $(W m^{- 1} K^{- 1})$ .

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Q. Match the following:

a) coefficient of thermal conductivity	e) $W m^{- 2} K^{- 4}$
b) temperature gradient	f) $W m^{- 1} K^{- 1}$
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Q. Match the physical quantities given in Column I with their SI units given in Cloumn II :

Column-I	Column-II
(a) Thermal conductivity	(p) Wm $^{- 2}$ K $^{- 4}$
(b) Stefans constant	(q) m-K
(c) Wiens constant	(r) J kg $^{- 1}$ K $^{- 1}$
(d) Specific heat	(s)Wm $^{- 1}$ K $^{- 1}$

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