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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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