PART II 



TABLE FOR DETERMINING ELECTRICAL CONDUCTIVITY 



OF SEA WATER 



BACKGROUND AND PURPOSE 



The determination of conductivity of sea water has been done by 

 using graphic methods and tables. Conductivity values, accurate to 

 3 decimal places, can be read by the graphic method currently in use. 

 Errors due to misjudgement of the space intervals on the graph may 

 result, particularly when eyestrain and fatigue reduce efficiency of 

 the operator, in determining extended series of conductances. Tables 

 currently used provide conductivity values only for whole units of 

 salinity (%o) and 5- degree (C) intervals of temperature. Interpolation 

 is required to obtain conductances equivalent to intermediate values, 

 that is, for salinity increments of .01 part per thousand and for 

 integral and fractional parts of temperature within the 5- degree 

 intervals. 



The table in this publication meikes possible the computation of 

 conductivity to the fourth decimal place for a wide range of temperature 

 and salinity values (to the second decimal place). Interpolation is 

 not required. Only one entry in the table is necessary to make the 

 computation. Computed conductance values may have an error of 2 

 or 3 units in the fourth decimal place, which is of sufficient accuracy 

 for many applications. 



ARRANGEMENT 



The table for determining electrical conductivity of sea water 

 presents values for temperatures from -Z.OCC to 30.0 CC and salinities 

 from 0.00%o to 39.99%o. The table is arranged in four parts by salinity 

 intervals of 10.00%c/. For a given temperature in column one the 

 corresponding conductivity value, L, for the base of the salinity interval 

 entered is indicated by column two. As the salinity value increases 

 the L- value increases by an amount equal to the factor, f, in column 

 three multiplied by the last three digits of the given salinity (observing 

 decimal places). Temperature values provided in column one are in 

 half-degree increments. Where the given temperature is intermediate 

 between the values provided, use the nearer limit of the interval. 



EXAMPLE OF COMPUTATION 



Given a temperature of 19.90°C and a salinity of 34.26%o compute 

 the electrical conductivity or L- value. 



19 



