Nitrogen filled Race Tires?
08-25-2006, 12:50 AM
#52
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Originally Posted by twohoos,Aug 24 2006, 04:59 PM
A side thought:
When my tire guys mount a tire on a rim, they first swab the bead of the tire with soapy water to help it pop over the edge of the rim. That simple action probably introduces as much or more water inside the tire than any water in the air used to inflate the tire. Or, put another way, even if they used N2 to inflate the tire, there'd still be a bunch of water in there!
So perhaps the way to get the inside as "dry" as possible is to heat the tire (vaporizing as much water as possible), then completely deflate, then reinflate with N2, and repeat...
When my tire guys mount a tire on a rim, they first swab the bead of the tire with soapy water to help it pop over the edge of the rim. That simple action probably introduces as much or more water inside the tire than any water in the air used to inflate the tire. Or, put another way, even if they used N2 to inflate the tire, there'd still be a bunch of water in there!
So perhaps the way to get the inside as "dry" as possible is to heat the tire (vaporizing as much water as possible), then completely deflate, then reinflate with N2, and repeat...
08-25-2006, 01:55 AM
#53
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hello everyone..i want to ask if you know anything about filling the tyre with n2o(nitron)..i was talking with some people which say that are usining nitron...anyone can help?? 
08-25-2006, 08:56 AM
#54
Originally Posted by mikegarrison,Aug 24 2006, 11:10 PM
Vaporized and gaseous are synonyms.
...vaporized water does obey the gas law...
...vaporized water does obey the gas law...
08-27-2006, 10:30 PM
#55
Water is liquid below 100 degrees C. However, that does not mean that it doesn't generate pressure below that temperature, and suddenly expands above it. That is approximately true, but now let's advance to the level of a first year high school chemistry course.
When you have a glob of liquid water surrounded by gas or vacuum, there will always be water molecules that evaporate and form water vapor. Once there is enough water vapor above the liquid, some of it will re-condense into the liquid. At equilibrium, the amount of vapor contributes a certain amount of pressure to the gas above the liquid, and that pressure is called the "vapor pressure". It increases with increasing temperature, and not in a linear fashion. It increases very quickly near the boiling point.
It is that temperature-versus-vapor pressure relationship, and not PV=nRT, that results in the difference in pressure gains between dry and moist air (or dry and moist nitrogen).
I don't use dry gases to fill my tires. I use an electric pump.
When you have a glob of liquid water surrounded by gas or vacuum, there will always be water molecules that evaporate and form water vapor. Once there is enough water vapor above the liquid, some of it will re-condense into the liquid. At equilibrium, the amount of vapor contributes a certain amount of pressure to the gas above the liquid, and that pressure is called the "vapor pressure". It increases with increasing temperature, and not in a linear fashion. It increases very quickly near the boiling point.
It is that temperature-versus-vapor pressure relationship, and not PV=nRT, that results in the difference in pressure gains between dry and moist air (or dry and moist nitrogen).
I don't use dry gases to fill my tires. I use an electric pump.
08-27-2006, 11:15 PM
#56
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Yes, that's what I said, in slightly different terms. Your answer is more understandable as a stand-alone response, though.
I use my garage air compressor to top off my tire pressure. It most certainly is not dry. There *is* a benefit to using dry air or N2, but not enough of one to make it worthwhile to me.
I use my garage air compressor to top off my tire pressure. It most certainly is not dry. There *is* a benefit to using dry air or N2, but not enough of one to make it worthwhile to me.
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