Sept. 5 , 1964
SCATTERING OF OPTICAL
n, = 1.308. T h e "liquid" may be assumed to behave like other normal unassociated substances whose molec2 ) . is the same in the ular refraction, -\f(n2 - 1) p ( n 2 vapor and in the liquid state. For water vapor this has 1 ? r the value of 3.7MXI which gives nl = 1.369. These two values however give an average refractive significantly higher than the experimental 1.334. In order t o obtain a conservative value of turbidity we can assume the above estinate of zc to be correct and take nl = 1.3360 to make it consistent with n . This gives 1.52 x lo-* for i j 2 ' e 2 , Combining these values gives 1.2 X 1 0 F for the excess turbidity of this model which is only slightly lower than the total observed turbidity of water and several times higher than the experimental excess turbidity estimated above. If the nl based on molar refraction is taken as a basis the calculated excess turbidity rises to 2.1 X which is still higher. Turbidity of the Network-with-Vacancies Model.--. The specific model consideredG 6 . :1'337j , 10 J 0 IIirschfelrler J Cli?in E l u i 16. 5 1 0 , I
