Originally Posted by
DrIsotope
Water expands as it gets hotter.
"At 212°F, 14.7 psia, liquid water has a specific volume of 0.016716 ft3/lbm and steam has a specific volume of 26.80 ft3/lbm, which is a volume ratio of ~1600 : 1 of steam:water."
When racing, we had tires running as little as 15psi, and heating to as much as 230º on the center of the carcass. So it doesn't take much moisture inside the tire to cause the pressure to raise at higher temperatures.
Hmmm...
I've wondered about my blowout I had a couple of years ago.
Brand new tire. Filled it up in the evening, say at around 15°C (288K), and by noon it may have been up to 30°C (303K).
It shouldn't have really made that much overall difference in pressure.
I wasn't braking heavily, although the asphalt could have been warm.
But, perhaps a little extra moisture could have contributed to over-pressuring. I likely had a used tube, so not sloshing with water, but perhaps a couple of inflation cycles would have slightly increased the moisture content.
One can dry compressor air. Probably a lot cheaper to simply dry the air than trying to buy N2 tanks.