I don't think it actually has much effect. In a full vacuum, water can't technically exist. If liquid water is introduced into a vacuum, it would immediately evaporate. If ice was thrown into a vacuum at a low enough temperature, it would remain ice. But -50 wouldn't do it, it would have to be extremely cold. At a higher altitude, I think water will still freeze at very close to 32F/0C, but it will evaporate at a lower temperature than 212F/100C. The same way a persons blood will boil above 62,000-63,500 feet. In an aircraft capable of high altitudes, it is possible for ice to form on the wings at say 30,000 feet, and at 65,000'+ it could evaporate from the wings, never becoming a liquid.
So basically, the air pressure has very little bearing on the freezing temperature of water.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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