Physical World Units and Measurements - Result Question 1

1. The unit of thermal conductivity is : [2019]

(a) JmK−1

(c) WmK−1

(b) Jm−1K−1

(d) Wm−1K−1

Show Answer

Solution:

  1. (d) In steady state, the amount of heat flowing from one face to the other face in time dt is given by

H=kA(T1−T2)dtℓ

⇒dHdt=kAℓΔT(k= coefficient of thermal conductivity)

∴k=ℓdHAdtΔT

Unit of k=Wm−1K−1

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