TABLE OF CONTENTS The thermal conductivity of a material is a measure of the ability to carry heat and is defined as
| (8.1) |  |
where k = thermal conductivity in W/m- C
q = heat flux in w/m 2
= temperature gradient in C/m in steady state
The negative sign denotes that heat flows from areas of higher temperature to areas of lower temperature. A plot of thermal conductivity vs. temperature for selected materials is shown in Fig. 8.6.
The specific heat of a material is defined as
| (8.2) |  |
where c = specific heat in W-sec/g- C
Q = energy in watt-sec
T = temperature in kelvins (K)
The specific heat, c, is defined in a similar manner and is the amount of heat required to raise the temperature of one gram of material by one degree, with units of watt-sec/g- C. The quantity specific heat in this context refers to the quantity, c V, which is the specific heat measured with the volume constant, as opposed to c P, which is measured with the pressure constant. At the temperatures of interest, these numbers are nearly the same for most solid materials. The specific heat is primarily the result of...
