Nitrogin in tires

[Snownyet]

Turning water into steam is my business! Water as a vapor which is basically steam,occupies 10 times the space as when its in a liquid state, so more water = more pressure change as temerature fluctuates.

[bigmurf]

If NASCAR and other racers use Nitrogen, why do they have to run a few laps to get the tires up to correct pressure?

[richfaa]

To turn water into steam it must have to get to @ 212 degrees...I don't think it get that hot inside a tire?????

[sailer]

Bob Pasternak You run 17" tires as i run 20" tires and it is to dark out to see the rest of the # on the tires

[MacDR50]

I consulted the information highway and.....

The process of evaporation in a closed container will proceed until there are as many molecules returning to the liquid as there are escaping. At this point the vapor is said to be saturated, and the pressure of that vapor (usually expressed in mmHg) is called the saturated vapor pressure.
Since the molecular kinetic energy is greater at higher temperature, more molecules can escape the surface and the saturated vapor pressure is correspondingly higher.

I think what was meant was that water as vapour has more volume than as a liquid. In actually fact the boiling point of water is 312F at 80psi. Also water as a gas behaves like any other gas, it expands in volume with heat and contracts as it cools. In a closed vessel this translates into less pressure. BTW water has one non-standard property. While most liquids contract even further as they solidify, water actually expands with incredible force.

The question is whether this mays any difference to tire heat and pressure.

[sailer]

So Roger after all this ducission and tech help , what is the conclusion of all the finding... john

[richfaa]

Say What???? And I thought I had everyone confused...

[Snownyet]

Sure it needs to be 212 to get steam(@ atmospheric presussure) but water molecules expand as they heat. I can assure you water takes up more space at 100 degrees than it does at 50 degrees. I worked for as a boiler operator in a coal fired power plant for 15 years, when we fill a boiler the difference in its cold level vs the level just prior to making steam is significantly different. In fact we have to fill cold so you can just visibly see water in the drum, at 200 degrees that water has swollen to the point where our boiler drum is better than half full, and being a closed vessel the boiling point is much higher and we're not even close to making steam.