Premium
The Sound Velocity in Ideal Liquid Mixtures from Thermal Volume Fluctuations
Author(s) -
Pfeiffer Helge,
Heremans Karel
Publication year - 2005
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200400534
Subject(s) - mixing (physics) , ideal (ethics) , compressibility , sound (geography) , thermodynamics , speed of sound , volume (thermodynamics) , chemistry , ideal gas , ideal solution , statistical physics , physics , acoustics , philosophy , epistemology , quantum mechanics
The selection of the correct mixing rule for sound velocity in ideal liquid mixtures determines the interpretation of the sound velocity in real mixtures. This is especially important for the determination of apparent properties of solutes, such as their apparent compressibility. There are different approaches reported in the literature, and this article presents a new derivation of the mixing rule based on statistical mechanics. It is shown that the correlation of volume fluctuations between adjacent components has a crucial influence on the ideal mixing rule.