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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