By I. Prigogine, Stuart A. Rice

The *Advances in Chemical Physics* sequence offers the chemical physics and actual chemistry fields with a discussion board for severe, authoritative reviews of advances in each quarter of the self-discipline. packed with state of the art study said in a cohesive demeanour no longer stumbled on in other places within the literature, each one quantity of the *Advances in Chemical Physics* sequence serves because the excellent complement to any complex graduate type dedicated to the research of chemical physics

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**Example text**

This lends support to the idea that Eq. (66)is a good approximation over the entire range between ,t = Q and 5 = 00. 30 Equation (39) shows that the first term on the right of (68)is G( co,x), so that G given by (68) approaches the correct limit for 6 --t co. If it is assumed that Eq. (68)is valid right down to t = +, we can substitute it into both (51) and (18), suitably transformed so that they depend upon 5 and x. This provides two equations in the three unknowns G(1, x), u(x), and d(x). A third equation is obtained by replacing a3p/xkT in (61))by G(m, x),making use of (40) so as to write G(co, x) in terms of G(1, x), and then setting 6 in (68) equal to unity.

The quantity p* which appears in Eq. (901must still be defined. I t is determined by the relation 7 The almost complete formal similarity between the exact relations which have been derived for 0 a n d those which have been derived in the preceding sections for G might lead one to hope t ha t 8 itself would have the same simple form exhibited by G in Eq. , 34 HOWARD REISS Unfortunately, this simple choice for the form of 0 does not appear to be satisfactory since when real or almost real potentials are employed it leads to results which are at variance with experiment.

3 The agreement in Table I is satisfactory when the simplicity of Eq. (133) is considered together with the fact that it specifies the surface tension a t a hard wall rather than the interfacial tension between a liquid and its vapor. I n the case of the diatomic molecules and benzene the strict requirement of spherical symmetry is not met, and furthermore the meaning of a as obtained from ref. 36 is somewhat obscure. E METHODS IK F L U I D S 51 spheres than they actually are. I t is of interest to note th a t the range of surface tensions involved is quite large (lo-1dynes/cm-l02 dynes/c m).