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>Testing the Lorentzndash;Lorenz relation in the nearhyphen;critical binary fluid mixture isobutyric acid and water
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Testing the Lorentzndash;Lorenz relation in the nearhyphen;critical binary fluid mixture isobutyric acid and water
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机译:Testing the Lorentzndash;Lorenz relation in the nearhyphen;critical binary fluid mixture isobutyric acid and water
The refractive index in each phase of the binary fluid mixture isobutyric acid and water was measured at temperatures below the systemrsquo;s upper consolute point. This data was combined with existing density data to test the Lorentzndash;Lorenz relation in a nearhyphen;critical binary fluid mixture. The Lorentzndash;Lorenz relation is verified within experimental error (0.5percnt;) when the volume change on mixing the components is taken into account. The density coexistence curve data is reanalyzed to determine the critical exponent thinsp;bgr; and amplitudeB. By allowing the order parameter to be a definition of the volume fraction that includes volume loss on mixing, a very symmetric coexistence curve is obtained which can be described by simple scaling with thinsp;bgr;=0.326plusmn;0.003 andB=1.565plusmn;0.021. This exponent agrees with theoretical predictions while the amplitude, when combined with existing turbidity data, confirms twohyphen;scalehyphen;factor universality. The amplitude obtained by analyzing the coexistence curve when the refractive index is the order parameter also combines with turbidity data to confirm twohyphen;scalehyphen;factor universality, but does not require knowledge of the volume loss on mixing or the composition dependence of the refractive index.
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