214 



Tables 230-231. 



CONDUCTIVITY FOR HEAT. 



TABLE 230. — Thermal Conductivity at High Temperatures- 



(See also Table 229 for metals; k in gram-calories per degree centigrade per second across a centimeter cube.) 



TABLE 231. — Thermal Conductivity of Various Substances. 



Substance, temperature. 



Aniline BP 103° C, -160. . 



Carbon, gas 



Carbon, graphite 



Carborundum 



Concrete, cinder 



stone 



Diatomaceous earth 



Earth's crust 



Fire-brick 



Fluorite, —190 



Flaorite, o 



Glass: window 



crown, 03172, —190.. . 



crown, 03572, o 



crown, 03S-2, 100 



h'vT flint oi65, —190. 



h'vy flint oies, o 



h'vy flint oies, 100. . . 



Glycerine, —160 



Granite 



Ice, —160 



Ice, o 



Iceland spar, —190 



Iceland spar, o 



Lime 



Limestones, calcite 1 



Marbles, dolomite J 



Mica 



Flagstone .L to cleavaj^e 



Micaceous 1 1 to cleavage 



.000112 

 .010 

 .012 

 . 00050 



.oooSi 



.0022 



.00013 



.004 



.00028 



•093 



■ 02s 

 .0025 

 .00118 

 .00280 

 . 003 24 

 .oooSi 

 .00170 

 .00181 

 .00077 



■ 0053 



.0066 

 .0050 

 .038 

 .0103 



. 00029 



.0047 to 



.0056 



.ooiS 



.0063 



.0044 



Refer- 

 ence. 



Substance, temperature. 



Naphthalene MP 79° C, -160. . . . 



Naphthalene M P ■'^° C. , o 



Naphthol — ;3, MP 122° C, — i6a 



Naphthol, o 



Nitrophenol, MP 114° C, —160. . . 



Nitrophenol, o 



Paraffin MP 54° C, —160 



Parafiin, o 



Porcelain 



Quartz _L to axis, —190 



" , o 



" , 100 



Quartz 1 1 to axis, o 



Rock salt, o 



Rock salt, 30 



Rubber, vulcanized, — iCo 



Rubber, o 



Rubber, para 



Sand, white, dry 



Sandstone, dry 



Sawdust 



Slate _L to cleavage 



Slate 1 1 to cleavage 



Snow, fresh, dens. = o.ii 



Snow, old 



Soil, average, sl't moist 



Soil, very dry 



Sulphur, rhombic, o 



Vaseline, 20 



Vuhanite 



References: (i) Lees, Tr. R. S. 1905; (2) Lorenz; (3) Norton; (4) Hutton, Blard; (s) Eucken, Ann. 

 d. Phys., 1911; (6) Herschel, Lebour, Dunn, B. A. Committee, 1879; (7) Jansson, 1904; (8) Melmer, 1911; 

 (9) Stefan. 



Smithsonian Tables. 



