Study of Equilibrium Critical Phenomena in Fluid Argon
<p>The refractive index of fluid argon was measured by using the method of angle of minimum deviation for λ<sub>Na</sub> = 5893Å. The measurements were carried out along the coexistence curve and along fourteen single phase isotherms from 150.7° to 163°K at pressures from 40 t...
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| Format: | Others |
| Language: | en |
| Published: |
1972
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| Online Access: | https://thesis.library.caltech.edu/10567/2/Wu_SY_1972.pdf Wu, Shyue Yuan (1972) Study of Equilibrium Critical Phenomena in Fluid Argon. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z20H-HM70. https://resolver.caltech.edu/CaltechTHESIS:11212017-114310188 <https://resolver.caltech.edu/CaltechTHESIS:11212017-114310188> |
| Summary: | <p>The refractive index of fluid argon was measured by using
the method of angle of minimum deviation for λ<sub>Na</sub> = 5893Å. The
measurements were carried out along the coexistence curve and along
fourteen single phase isotherms from 150.7° to 163°K at pressures from
40 to 90 atmospheres.</p>
<p>The Lorentz-Lorenz relation was used to relate the refractive
index data to the densities and subsequently to find the isothermal
compressibilities along the singla phase isotherms. Following the law
of rectilinear diameter and the simple power laws for critical
exponents, the values of the critical temperature and exponents for
argon were found to be T<sub>c</sub> = 150.725° ± 0.010°K, β = 0.3574 ± 0.0027,
and γ = 1.170 ± 0.013. Also values of n<sub>c</sub> = 1.08611 and
P<sub>c</sub> = 47.983 atm were determined. These values agree well with
others reported for argon. Comparison of the values of β and γ
with those predicted by the classical theory and the three-dimensional
lattice gas model suggests that the latter gives a better description
of the critical behavior of fluid argon.</p>
<p>Analysis of the reduced chemical potential differences, computed
from the refractive index data along the singla phase isotherms,
has been made by using the scaled equation of state first proposed by
Widom. Reasonable values T<sub>c</sub> and γ were obtained when the
value of β determined above was used.</p> |
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