Table 484 

 RESISTIVITY OF METALS AND SOME ALLOYS 



409 



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

 microhms of a length /cm of uniform cross section 5 cm 2 . The temperature coefficient isa s in 

 the formula R t = R a [i + a s (t — /,)]. The information of column 2 does not necessarily 

 apply to the temperature coefficient. See also next table for temperature coefficients o° to 

 loo°C, also page 413 for values on metals of high purity. 



Substance 



Advance . 

 Aluminum. 



Antimony. 



Arsenic . . . 

 Beryllium . 

 Bismuth. . 



Brass 



Cadmium . 



Caesium . . 



Calcium. . . 

 Calido .... 

 Chromium. 

 Climax. . . . 



Cobalt 



Constantan 



Copper 



Eureka 



Excello 



Gallium 



German silver 

 Germanium. . . 

 Gold 



ia ia'.'".'!'.;; 



Ideal 



Indium 



Iridium 



Remarks 



see constantan 

 see p. 421 

 P- 



liquid 



drawn 

 liquid 



solid 1 

 liquid / 

 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 



+ 100 

 400 



— 190 

 + 860 



18 



100 



20 



-160 



18 



100 



3i8 



-187 



o 



27 



30 



Microhm 

 cm 



— 206 



+ 205 



400 



183 



-186 



o 



-f 100 



2.828 

 .64 

 1-53 

 2.62 

 3-86 

 8.0 



39-1 



10.5 

 120 



35 



10. 1 



1 19.0 



160.2 



7 



2.72 

 7-54 

 9.82 



34-1 

 5.25 



19 



22.2 



36.6 

 4-59 



2.6 

 87 

 9-7 



49 



1.724 

 1.77 

 .144 

 2.92 

 4.10 

 1.692 



92 



53 



33 



89000. 



.68 



2.22 



2-44 



3-77 



8.37 

 1.92 

 6.10 

 8.3 



Refer- 

 ence 



3 

 3 

 3 

 3 

 3 



30 

 6 

 7 

 8 



31 

 9 

 9 

 5 



10 

 9 

 9 



5 

 32 



17 



Temperature coefficient 



25 



100 

 500 



12 



25 

 100 

 200 

 500 



20 see col. 2 



100 

 400 

 1000 



100 ann'ld 

 500 

 1000 



+0.0039 

 + .0034 

 + .0040 

 + .0050 



+ .0036 



+ .004 



+ .002 

 + .0038 



+ .0036 



+ .0007 



+ .000008 



+ .000002 



- .000033 



— .000020 

 + .000027 

 + .00393 

 + .00382 

 + .0038 

 + .0042 

 + .0062 



+ .00016 



+ .0004 



+ .0034 

 + .0025 

 + .0035 

 + .0049 



Refer 

 ence 



Arranged in Order of Increasing Resistivity (ohm-cm 3 X 10 6 , 20°C) 



Smithsonian Tables 



