Check my math regarding partial pressure.

[boulderjohn]

It's simple. And as a bonus, PP blending with N2 doesn't require oxygen clean tanks & regs.

...what? Are you saying you don't have an N2 tank?

I am embarrassed to say I don't, but now that I think of it, I should. My newer car came with its tires filled with nitrogen, and it was recommended that I maintain that practice. Stopping by gas stations to top off tires when they are low has forced me to substitute a 78% blend--hardly ideal, but the best i could do.

 

[wedivebc]

I'm guessing math practice, or just understanding partial pressures. I have no idea how I would get a mix of 6% O2 and 94% N2. It would probably have to call for re-engineering a membrane system

It's easy to do in a rebreather if you're not paying attention

 

[rhwestfall]

It's easy to do in a rebreather if you're not paying attention

 

[Lorenzoid]

Before every drive, you really should analyze your tire gas, John.

 

[JohnnyC]

It's easy to do in a rebreather if you're not paying attention

I would hope that someone asking a "check my PO2 math" problem on Scubaboard wouldn't be driving a rebreather......

Although stranger things have happened.....

 

[Storker]

I am embarrassed to say I don't, but now that I think of it, I should. My newer car came with its tires filled with nitrogen, and it was recommended that I maintain that practice. Stopping by gas stations to top off tires when they are low has forced me to substitute a 78% blend--hardly ideal, but the best i could do.

Fortunately, a car tire usually takes only 2-2.5 bar (gauge), so you should probably be fine. With a road bike, OTOH, you might well come a bit close to the 1.6 ppO2 limit.


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[BRT]

I am embarrassed to say I don't, but now that I think of it, I should. My newer car came with its tires filled with nitrogen, and it was recommended that I maintain that practice. Stopping by gas stations to top off tires when they are low has forced me to substitute a 78% blend--hardly ideal, but the best i could do.

Which reminds me of the engineer who stopped by our tire shop with a sports car with worn out tires and wanted them topped up with nitrogen. I told him the best we could do was about 80% and he thought that was good enough. I said if it was good enough to breath it was good enough for tires and he finally caught on.