3/6 TABLE 372.— CONTACT DIFFERENCE OF POTENTIAL IN VOLTS* 



Solids with liquids and liquids with liquids in air 



Temperature of substances during experiment about 16°C 



H,0 



c 

 .01 

 to 

 .17 



Alum. sat. sol. 

 C11SO4 sol. 



sp.gr. 1.087 

 CuS0 4 sat. sol. 

 Sea salt sol. 



1.18 at 20°C 

 NH4CI, sat.sol. 

 ZnS0 4 sol. 1.125 



at 4°C .... 

 Z11SO4 sat.sol. 

 One part H 2 + 



3, sat. ZnSCX .. 

 Strong H2SO4 in 



water : 

 1 to 20 by wt 



1 to 10 by vol \ 



lto 5 by wt 



5 to 1 by wt. . 



Con. JLSO4 



about 

 -.035 



.01 " 



to 

 3.0 



.55 

 to 

 .85 



.148 



Cu 



.269 

 to 

 .100 

 —.127 -.653 



.103 

 .070 



-.475 -.605 

 -.396 -.652 



1.113 



Pb 



.171 

 .139 



.189 



Pt 

 .285 



to 

 .345 

 .246 



-.856 

 .059 



-.120 



.72 



to 



1.252 



1.3 



to 

 1.6 

 .672 



Sn Zn 



r— .105 



.177 < to 

 [+.156 



-.225 -.536 



-.334 -.565 



-.364 —.637 



... -.238 



. . —.430 



... —.444 



-.344 



,25 



Amalg. 

 Zn 



.100 



.284 



-.358 

 .429 



.848 



Brass 



.231 

 .014 



-.435 

 —.348 



-.016 



Distilled 

 water 



-.200 



1.298 



Con. HNO3 



Mercurous sulfate paste, Hg, + .475. Sat.CuSCXsol., H 2 0, — .043 ; sat.ZnSC^sol., + .095 ; 1 pt. 

 H»0. 3 pt. ZnSC>4 + .102. 



Concentrated H 2 SC>4, H 2 0, + 1.298 ; sat.alum.sol., + 1.456; CnSChsat. + 1.269; ZnSC>4sat.sol., 

 + 1.699. 



* Everett, Units and physical constants: Table of Ayrton and Perry's results, prepared by Ayrton. 



TABLE 373.— THERMAL ELECTROMOTIVE FORCE OF ALUMINUM 

 VERSUS PLATINUM uo 



Temperature versus emf 



110 Nat. Bur. Standards Circ. 346, 1927. 



SMITHSONIAN PHYSICAL TABLES 



