Accession Number:

AD0679023

Title:

A GENERALIZED EQUATION FOR DROPLET GROWTH DUE TO THE SOLUTION EFFECT,

Descriptive Note:

Corporate Author:

ATMOSPHERIC SCIENCES RESEARCH OFFICE WHITE SANDS MISSILE RANGE N MEX

Personal Author(s):

Report Date:

1968-09-01

Pagination or Media Count:

26.0

Abstract:

The fundamental parameter generally accepted in physical chemistry to account for the departure of a solution from ideality due to ionic dissociation and other causes is the mean ionic activity coefficient of the solute, rather than the vant Hoff factor commonly used in the literature and textbooks on cloud physics. It is directly related to many properties of a solution, one of which is the lowering of vapor pressure. The data on the activity coefficient of various electrolytes or salts are abundant and readily available therefore it is fitting to express the equation for the solution effect on droplet growth in terms of this important parameter. A table is presented which gives the activity coefficients, the practical osmotic coefficients, and the vant Hoff factors of several salts in different concentrations. It is then shown that the generalized equation can be readily and exactly reduced to the expression derived by Byers for all concentrations and approximately to those given by Mason and Fletcher for very dilute solutions. Author

Subject Categories:

  • Meteorology
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE