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Trailer Tires Overheating.
"Mark Browne" wrote in message news:8H_mb.39146 The reason is that the water in the air does NOT act like an ideal gas. Gosh, I didn't realize that there had been a change in the laws of physics since I went to college! When did this happen? Man, things were easier back in my day when any gas obeyed the gas laws! Remember when the steam tables were what you would use for any gas you didn't know the properties of? Think about what happens to the pressure/volume curves as the tire reaches 100 degrees C. The vapor pressure for water will vary over a very large temperature range. Fortunately, it is predicatable and monotonic. If you didn't have liquid water in the tires when they were cold, you won't have any liquid in them as they heat up. I can see reasons that a race car might want to use nitrogen in their tires. It is a nice, safe gas. It is realatively cheap. The fact that it is readily available in a very dry state can have its advantages: I can imagin that avoiding any condesation when the tire was cold could be an issue, especially during the winter. The issue would be maintaining a "predictable" inflation pressure as the tires went from "colder than when they were inflated" to nominal operating temperatures. I suppose that condensation could also be an issue when the wheels were balanced. Rod |
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