Conversion of Water Vapor to Ice by Silver Iodide

T. G. Owe Berg T. G. Owe Berg, Inc., Santa Ana, Calif.

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Joyce E. Clutter T. G. Owe Berg, Inc., Santa Ana, Calif.

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Thomas A. Gaukler T. G. Owe Berg, Inc., Santa Ana, Calif.

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Robert L. McDonald T. G. Owe Berg, Inc., Santa Ana, Calif.

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Abstract

Experiments were conducted with sublimate AgI or AgI smoke in an expansion chamber at various temperatures. A condensate cloud of liquid droplets was formed at all temperatures. Below −5C ice crystals appeared in the cloud a few seconds after its formation. Photographs were taken of liquid droplets and of partially frozen droplets. The droplet diameter was 7 μ above 0C, but at lower temperatures it was larger, reaching 15 μ at −7C. The results show that the water vapor is converted to ice by condensation followed by freezing of the liquid droplets under these conditions. Impurities in the AgI and the air had no effect upon these observations.

Abstract

Experiments were conducted with sublimate AgI or AgI smoke in an expansion chamber at various temperatures. A condensate cloud of liquid droplets was formed at all temperatures. Below −5C ice crystals appeared in the cloud a few seconds after its formation. Photographs were taken of liquid droplets and of partially frozen droplets. The droplet diameter was 7 μ above 0C, but at lower temperatures it was larger, reaching 15 μ at −7C. The results show that the water vapor is converted to ice by condensation followed by freezing of the liquid droplets under these conditions. Impurities in the AgI and the air had no effect upon these observations.

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