Table 397. 

 RESISTIVITY OF METALS AND SOME ALLOYS- 



323 



The resistivities are the values of p in the equation R = pl/s, where R is the resistance in microhms of a length 

 I cm of uniform cross section j cm^. The temperature coefficient is as in the formula Ri = Rs\i + as(t — ts)\. The 

 information of column 2 does not necessarily apply to the temperature coefficient. See also next table for tempera- 

 ture coefficients 0° to 100° C. 



Substance. 



Advance 



Aluminum . . . 



Antimony 



Arsenic 



Bismuth 



Brass 



Cadmium. . . . 



Caesium 



Calcium 



Calido 



Chromium . . . 



Climax 



Cobalt 



Constantan . . 



Copper 



Eureka 



Excelio 



GaUium 



German silver 

 Gold 



la U.\'.'.'.\'.'. 



Ideal 



Indium 



Iridium 



Remarks. 



see constantan 

 see p. 334 

 c.p. 



liquid 



drawn 



liquid 



solid 1 

 liquid J 

 99.57 pure 

 see constantan 



99 . 8 pure 



60% Cu, 40% Ni 



annealed 

 hard -drawn 

 electrolytic 



pure 



very pure, ann'ld 



see constantan 



18% Ni 

 99 . 9 pure 



pure, drawn 

 99 . 9 pure 

 see constantan 



Tempera 

 ture, 

 "C 



-189. 

 —100. 



-fioo. 

 400. 



— 190. 

 -f86o. 



r8. 

 100. 



100. 



318. 



-187. 



o. 



27. 



30. 



20. 



20. 



— 206. 



+205. 



400. 



20. 



20. 

 o. 



20. 

 -183. 



o. 



20. 



194- S 



-i85. 



o. 



-t-ioo. 



Temperature coefficient. 



18° 



25 



100 



500 



25 

 100 

 200 

 500 



20 see col. 2 



100 

 400 

 1000 



100 ann'ld 

 500 " 

 1000 " 



+ .0039 



+ .0034 

 -f- . 0040 

 -j-.ooso 



+ .<X)i(> 



+ .004 



+ .002 

 -i-.oo38 



-f .0036 



-I-.OO07 



4- . 000008 

 -j-. 000002 

 — . 000033 

 — . 000020 

 -|-. 00002 7 

 + . 00393 

 -(-.00382 

 -H.0038 

 -I-.0042 

 -i-.oo62 



-l-. 00016 



4- . 0004 

 + • 0034 



+ .002S 



+ .003S 



+ . 0049 



Refer- 

 ence. 



Arranged in order of Increasing resistivity (olun-emsxiO~«, 20°0). 



w 



Mn 



Mo 



Zn 



Ir 



K 



Ni 



Cd 



in 



Li 



Fe 



S-o 



s.± 



(5.3) 



5-75 



6.10 



61 



6-93 



7.04 



8.37 



8.55 



8.8 



Co 

 Pd 

 Pt 

 Rb 

 Sn 

 Ta 

 Tl 

 Cs 

 Pb 

 Sr 

 As 



Cmithsonian Tabucs. 



