Speeds of sound and isothermal compressibility
of ternary liquid systems: Application of Flory's
statistical theory and hard sphere models
VIMLA VYAS
Thermo-acoustics Research Lab, Department of Chemistry,
University
of
E-mail: vimlavyas@rediffmail.com
Abstract. Speeds
of sound and densities of three ternary liquid
systems namely, toluene + $n$-heptane + $n$-hexane (I), cyclohexane
+ $n$-heptane
+ $n$-hexane (II) and $n$-hexane + $n$-heptane
+ $n$-decane (III) have been measured
as a function of the composition at
298.15 K at atmospheric pressure. The
experimental isothermal
compressibility has been evaluated from measured
values of speeds of sound and
density. The isothermal compressibility of
these mixtures has also been
computed theoretically using different models
for hard sphere equations of state
and Flory's statistical theory. Computed
values of isothermal
compressibility have been compared with experimental
findings. A satisfactory agreement
has been observed. The superiority of
Flory's statistical theory has
been established quite reasonably over hard
sphere models.
Keywords. Flory's
statistical theory; hard sphere models;
isothermal compressibility; ternary
liquid systems.
PACS Nos 43.35.Bf; 61.20.Gy; 82.60.Lf