60 



In Table XIII the fourth column contains specific conductances calcu- 

 lated from the empirically determined equation (15), which takes the form 



K = 0.02906 + 2.65 x lO'"^? (17) 



When P is expressed in bars, Kp becomes equal to 0.02906 + 3.84 x 10"°P. 

 The values in column six of Table XIII were obtained by interpolation of chlo- 

 rinity-specific conductance data of Thomas, Thompson, and Utterback.(15) 

 The chlorinities were calculated from salinities using equation (13), and the 

 salinities in turn were computed from the relation 



(Salinity) p = (Salinity) ^ ^^^ / V^ (18) 



where Vd is the relative volume of the sea water at pressure P compared with 

 its volume at 1 atmosphere .(28) The relative volumes were obtained from the 

 relation 



where the values of /3 used are those of 35°/oo salinity sea water at 0°C, as 

 given by the International Critical Tables .(29) 



In addition to NaCl, sea water contains other species (see Table XIV), 

 and some of these may form weak electrolytes . In general, the ionization of weak 

 electrolytes and hence their contribution to electrical conductivity increases with 

 increasing pressure .(30) 



TABLE XIV 



COMPOSITION OF SEA WATEr( 3^) 



Ion Concentration 



(gm/kgm) 



Na+ 10.556 



Mg++ 1.272 



Ca++ 0.400 



K+ 0.380 



Sr++ 0.013 



Cr . 18.980 



SO4" 2.649 



HCO3" 0.140 



Br- 0.065 



Arthur B.littbJnt. 



S-700 1-0307 



