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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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