204 ELECTRICAL RESISTANCE OF ACETIC ACID 



ponding to a particular electrometer reading will be lower 

 than this. However the true temp, resistance curve shown as 

 the dotted line, drawn from m to f, parallel to h.g. The part 

 of the curve cj indicates clearly the discontinuity in resistance 

 at the eutectic point; it shows that when -26.55°C is reached 

 the resistance of sample 2, changes suddenly from 10^° to 

 8.8 X 10^; this change being due to the solidification of the 

 liquid portion between the electrodes. 



When the temperature reaches 15°C, melting of the sub- 

 stance was apparent and the specific resistance decreases very 

 rapidly from 1.27 x 10^ to 3.52 x 10^ @ 17.5°C, when lique- 

 faction is complete. The part of the curve ac, shows the 

 variation of the specific resistance with temp, in the liquid 

 phase. Values of the specific resistance in the solid and 

 liquid phases of sample No. 2, are given in table 3. 



