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JAMB Physics 1979 Question 24

Question 24

Heat Transfer

What are the units of thermal conductivity?

  1. A.kg m sec2
  2. B.Joule sec−1 m−1 K−1
  3. C.kg m
  4. D.Newton sec−1 m−1 k−1
  5. E.m3
Show the answer and explanation

Answer: B (Joule sec−1 m−1 K−1)

Explanation

Thermal conductivity is the rate of heat flow (J s−1) per unit length and per kelvin of temperature difference: J s−1 m−1 K−1 (W m−1 K−1).