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We have measured the coexistence curve of the binary liquid mixturen-heptane+nitrobenzene near its consolute point using an optical method. Inparticular, the critical exponent beta describing the coexistence curve wasmeasured for this system. Previous experimental values of beta forn-heptane+nitrobenzene were higher than the typical theoretically calculatedvalue, an unusual, although not unique, occurrence. In an effort to study thisdiscrepancy, we have used an improved experimental apparatus for ourmeasurements. We have taken special care to minimize temperature gradients andmaximize the temperature stability of our thermal control system. We have alsoexploited features of a known optical method to analyze, thoroughly, sources ofsystematic errors. We measured an apparent value of beta as 0.367+/- 0.006 andby a careful study of the known sources of error we find that they are not ableto remove the discrepancy between the measured and the theoretical values ofbeta. We also measured the critical temperature of the system at Tc=291.80+/-0.02 K (18.65 C).Comment: 21 pages, 8 figures, submitted to Physical Review B. Shrunk  Experimental section, expanded Equilibration and Conclusion sections,  eliminated a figure, added reference; 19 pages, 7 figures, resubmitted to  PRB. Replaced Fig. 3, added separate simple text file with coexistence curve  data (OPvsT.txt); resubmitted to PR

physical review. b, condensed matter and materials physics

Coexistence curve of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>n</mml:mi><mml:mtext>−</mml:mtext><mml:mtext>heptane</mml:mtext><mml:mo>+</mml:mo><mml:mtext>nitrobenzene</mml:mtext></mml:mrow></mml:math>mixture near its consolute point measured by an optical method

Coexistence curve of then−heptane+nitrobenzenemixture near its consolute point measured by an optical method