INVESTIGATION OF THE KINETICS OF CONDENSATION.
Final rept. 1 Jul 66-30 Jun 67,
BERG (T G OWE) INC SANTA ANA CALIF
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Nucleation of condensation in an expansion chamber using NH4Cl particulate has been studied. The NH4Cl particulate was prepared by mixing gaseous NH3 and HCl, both at a concentration of 20ppm in pure bottled air. When laboratory air was carefully excluded from the system, the NH4Cl formed no detectable cloud before or after expansion. When a trace of NO, less than 10ppm in N2, was added to the NH4Cl there was no cloud before the expansion but a dense cloud after expansion. It is concluded that the condensation occurs by a chain reaction type mechanism, in which the NO serves as the chain initiator and the NH4Cl particulate serves to stabilize droplets that are too small to be stable alone. The initiator gas in ordinary air remains to be identified. It was found that NO may be removed from air by adsorption in an aerosol filter. Author