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 Contents Page Table 17 1. Thermal conductivity of cubic single crystals 245 2. Conductivity of crystal powders cemented by compression to 8000 atmospheres 247 3. Thermal conductivity of noncubic single crystals 248 4. Thermal conductivity of rocks 251 4.1. Effect of wetting and of simple compression on the thermal conductivity of certain rocks 258 5. Thermal conductivity of soil, snow, ice 259 6. Thermal conductivity of glass 260 7. Conductivity of a few common metals 262 8. Thermal conductivity of miscellaneous materials 263 9. Thermal conductivity of some common liquids, as function of pressure and temperature 265 10. Effect of hydrostatic pressure upon the thermal conductivity of solids 266
 Contents Page Table 17 1. Thermal conductivity of cubic single crystals 245 2. Conductivity of crystal powders cemented by compression to 8000 atmospheres 247 3. Thermal conductivity of noncubic single crystals 248 4. Thermal conductivity of rocks 251 4.1. Effect of wetting and of simple compression on the thermal conductivity of certain rocks 258 5. Thermal conductivity of soil, snow, ice 259 6. Thermal conductivity of glass 260 7. Conductivity of a few common metals 262 8. Thermal conductivity of miscellaneous materials 263 9. Thermal conductivity of some common liquids, as function of pressure and temperature 265 10. Effect of hydrostatic pressure upon the thermal conductivity of solids 266

In an isotropic homogeneous material the conduction of heat depends upon a single “constant” of the material, known as the thermal conductivity; this “constant” is a function of temperature, pressure, and other variables. The quantity of heat dQ conducted in unit time across an element of surface dS is given by the fundamental relation, $d Q = − K d T d n d S$ where K is the conductivity and dT/dn the gradient of the temperature in the direction of the normal to the surface element dS. Two “ c.g.s.” units of heat are in common use; the calorie (gram-calorie) and the joule; 1 calorie equals 4.185 joules. Using the centimeter, second, and Centigrade temperature scale, the corresponding units for thermal conductivity are the cal.·sec.−1cm.−1deg.−1 and the watt.·cm.−1deg.−1 (1 watt equals 1 joule/sec.).
$1 c a l . ⋅ sec . − 1 cm . − 1 deg . − 1 = 4.18 5 watt ⋅ cm . − 1 deg . − 1 1 watt ⋅ cm . − 1 deg . − 1 = 0.239 cal . ⋅ sec . − 1 cm . − 1 deg . − 1$

A unit sometimes encountered in engineering work is the British thermal unit per square foot per hour for . . .

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