Temperature Dependence of the Electrical Resistance for Isobutyric Acid-Water near the Critical Point

The electrical resistance of two sealed samples of critical mixtures of isobutyric acid-water have been measured in the reduced temperature ranges [ε=T-Tc)Tc] 6.7×10^-7<ε<3.2×10^-2 and 3.3×10^-7<ε<6.6×10^-2. Data analyses indicate that the temperature derivative of the resistance is strongly divergent as ε→0.