200 



ELECTRICAL RESISTANCE OF ACETIC ACID 



crease slowly and then with great rapidity until the tem- 

 perature has risen to the melting point d. Liquefaction 

 then begins and the resistance decreases very irregularly 

 until finally the liquid phase alone exists in the tube, and the 

 point /, is reached. It is well to state here that the points on 

 the curve between the eutectic temperature and the melting 

 point, really do not represent the specific resistance of the 

 solid phase, but the resistance of the tube multiplied by the 

 cell constant. The specific resistance in the liquid phase in- 

 creases T^-ith falling temperature. This is indicated by the 

 part of the curve, e a c. which is quite normal as was to be 

 expected. It is seen that there exists a point, a, at which the 

 specific resistance in the liciuid phase is equal to the so called 

 specific resistance in the solid phase at the same temperature. 

 This point was not found to exist in the case of acids which 

 had been more carefully purified. 



/0° X 



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