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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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