Word: vapor
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...Vapor Trails Compared...
Highly likely, Professor Mather suggested, was the possibility that watchers on the ground would see jet plane exhausts without seeing the plane itself. He compared the discs to the vapor trails left by high altitude bombers over England and Germany during...
...vapor-bath system which sprays the bather with various chemicals. Price: $2,200. It was represented as effective for diabetes, abscess of the lung, decay of the jawbones, blood poisoning, a long list of other ailments...
...into the fog in their laboratory "cold chamber." Silver iodide did the trick magnificently, turning the fog to snow. Silver iodide crystals are hexagonal, as snow crystals are. Apparently snowflakes recognize the kinship and are fooled into hanging on. An infinitesimal whiff is enough. In the presence of iodine vapor a single electric spark will knock enough silver out of a dime to start a snow flurry. Burning a cotton string impregnated with silver iodide makes enough crystalline smoke to cause a sizable snowstorm...
From the cloud's upper surface great pustules of vapor arose. Out of its base poured streamers of snow. They evaporated before they could reach the ground, but Schaefer flew back to Schenectady in triumph. He had touched off the first man-made snowstorm...