Significance of negative sign in equation of Fouriers law of heat conduction - Heat Transfer

Q.  Why is the negative sign introduced in the equation of Fourier's law of heat conduction?

q = – kA (dT / dx)

- Published on 11 Aug 15

a. because heat transfer rate is inversely proportional to temperature gradient
b. because value of thermal conductivity k is negative
c. because heat is transferred from higher temperature to lower temperature
d. none of the above

ANSWER: because heat is transferred from higher temperature to lower temperature

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    Discussion

  • shahzain   -Posted on 28 Jan 17
    it's not a proper reason
  • Krunal   -Posted on 22 Dec 16
    Nice answer

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