Accession Number:

ADA199732

Title:

Ion Content of Moist Atmospheric Air and the Molecular Structure of Water Vapor Thus Inferred

Descriptive Note:

Technical rept. May 1986-May 1987

Corporate Author:

CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1988-07-01

Pagination or Media Count:

48.0

Abstract:

A great deal of multidisciplinary research, reported in the open literature, suggests that even the cleanest water vapor is not simply a collection of single water molecules monomers as is popularly supposed, but also contains vast populations of molecular aggregates of clusters especially under conditions of high humidity. These water clusters include not only collision-induced, Boltzmann-distributed dimers, trimers, etc., but also a preponderance of much larger evaporatively-produced clusters that are extensively hydrogen bonded and thus from equilibrium populations in the vapor. The question of the extent of such clustering in the vapor versus temperature and humidity has been investigated in rigorous new measurements of the electrical conductivity of moist air. The ion populations measured in the vapor give excellent agreement with those predicted by equations developed from first principles of kinetic theory. These ion populations are dissociative products of the large clusters. Keywords Moist Air Water Vapor Ions Water Clusters Hydrogen bonding Electrical Conductivity Nucleation Evaporation Infrared.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE