Abstract
TWOMEY'S chemical diffusion chamber useful in the atmospheric small supersaturation (1959) was improved in some points and made available for field work.
In th e laboratory small volumes of air were sent into a diffusion chamber and an expansion chamber both in the same supersaturations.
Concentrations and size distributions of formed droplets in both chambers were compared putting several artificial nuclei into them and moreover poisoning effects on nuclei surfaces by gas substances were studied.
In the formation of droplets it was found that not only supersaturation, water content and cooling rate of air, but also the poisoning effect caused by environmental gas substances were important factors. Both surface tension and contact angle of oily gas substances affected droplet formation.
