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And it goes without saying that any water in the gas in the tyre has already boiled unless it's sloshing round
I'm out of my depth here, but this bit doesn't make sense to me.
Surely most air has got water in it, in the form of vapour, well below boiling temperature/above boiling pressure ?
Increasing the pressure reduces air's capacity to hold water as vapour. That's why air braked vehicles have air dryers and workshop compressors have water traps.
I'm wrong and so is everyone else who thinks it'll make a difference:
[url= http://www.carbibles.com/tyre_bible_pg3.html ]http://www.carbibles.com/tyre_bible_pg3.html[/url]
From that site...
Let's say your standard tyres are 185/65R14 - a good middle-ground, factory-fit tyre. That means the tread width is 18.5cm side to side.
The tread width will be less than 185mm.
Imperial tyres are measured across the tread, metric tyres are measured over the maximum width at the sidewalls. A 7.50" tyre is equivalent width to a 235mm tyre.
Surely most air has got water in it, in the form of vapour, well below boiling temperature/above boiling pressure ?
water vapour and steam (not condensation) are the same thing - water molecules in the gaseous state. All simple molecules (non polymers) have a vapour pressure at any temperature above absolute zero, where a certain proportion are in the gaseous state in equilibrium with any other phases present. Above the boiling point, that proportion is 100%.
As far as I can make out the vapour pressure doesn't depend on the partial pressure of the other gasses present (if any), so it's not the capacity of the air or whatever to hold water, as it could still be there in a vacuum.
Corrosion , who would have thought of that....the AA?
http://www.theaa.com/motoring_advice/safety/filling-tyres-with-nitrogen.html
Why not use bowel gas?
I think I'm getting water vapour and condensation mixed up then.
Condensation is water vapour that has met a cold surface or an area of high pressure, so that the molecules form drops of water. Is that right ?
Most workshops have a water separator in the airline somewhere to remove this condensation, so very little of it will end up inside the tyre.