Coexistence curve and rectilinear diameter in the critical liquid system carbon disulphide+nitromethane |
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Authors: | E S R Gopal R Ramachandra P Chandra Sekhar |
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Institution: | (1) Department of Physics, Indian Institute of Science, 560012 Bangalore |
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Abstract: | The phase boundary of the binary liquid system CS2+CH3NO2 is studied over nearly six decades in reduced temperature 3×10−6<ε=(T
C−T)/T
C<2×10−1 and over the composition range 8-98 mole % of CS2. The critical parameters areT
C=335.132K andx
C=57.34 mole % of CS2. A single critical exponentβ=0.315±0.004 fits the observations over the entire range with no indication ofβ increasing to the classical value of 1/2 far away fromT
C. The diameter of the coexistence curve shows a rectilinear behaviour only far away fromT
C. NearT
C, the deviation ΔX from the rectilinear law seems to fit a curve of the form ΔX=fε7/8 exp (−gε
h), the derivative of which has a singularity like that of specific heat. An ambiguity in the analysis of the data in terms
of mole fractions and volume fractions is pointed out. It is also suggested that the curvature of the diameter may be much
weaker in a liquid-gas system and hence might have escaped detection. |
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Keywords: | Critical point phenomena rectilinear diameter critical exponents phase boundary CS2+CH3NO2 liquid system |
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