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THERMAL CONDUCTIVITY by armallah223

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									         THERMAL CONDUCTIVITY
   Thermal conductivity is defined as" the amount of heat conducted in one second
through one cubic meter of a substance whose two opposite faces are maintained at
the temperature difference of one degree centigrade."
It is denoted by "K".


Formula
K=QL/ATt



Unit :
Unit of thermal conductivity is J/mKs OR watt/m.K.

                            EXPRESSION FOR
                         THERMAL CONDUCTIVITY




Experiments indicates that the amount of heat conducted through a solid block is :



  Directly proportional to temperature difference between two faces of block.
                            Q T ...................... (i)


  Directly proportional to the area of cross - section of block.
                             Q ...................... (ii)

  Directly proportional to the the time interval to which heat is conducted.
                             Q t ...................... (iii)

  Inversly proportional to the length of block.
                           Q 1/L ...................... (iv)
Combining above facts,we get
                                   Q T..t /L
                                            OR




                                            OR

								
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