The electrical resistance of the binary liquid system cyclohexane + acetic anhydride is measured, in the critical region, both in the pure mixture and when the mixture is doped with small amounts (≈ 100 ppm) of H2O/D2O impurities.Tc was approached to aboutt=3×10−6 wheret=(T −Tc)/Tc. The critical exponentb ≈ 0.35 in the fit of the resistance data to the equationdR/dT ∼t−b does not seem to be affected appreciably by the impurities. There is a sign reversal ofdR/dt in the non-critical region. Binary liquid systems seem to violate the universality of the critical resistivity.
Volume 94, 2020
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