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How many butyl tubes will solve global warming?
:) |
Originally Posted by iab
(Post 20635812)
Colnago carbon. Full Campy EPS. Enve wheels.
Full dentist. |
Originally Posted by pastorbobnlnh
(Post 20635309)
Wait! Wait! WAIT!!!! Is not CO2 heaver than regular old air? Why would a serious weight conscience bicyclist every use CO2 in their tires? :twitchy: CO2 would slow down the rotational rate of their wheels! :eek
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Originally Posted by Tamiya
(Post 20635671)
1 mol of gas is 22L... that's like a quartet of car radials? :) Mole of gas would be number of molecules, Avogadro's Number? Basically it's a standard mass, not of volume. |
A few days ago I had a flat about 2miles from the finish of my ride. I used the mini pump but it had a leak and wouldn’t get the tire more than about 20psi so I burned a CO2 to get home. In this case the CO2 was the backup to the pump! I hat to use the CO2 because they are wasteful and expensive but on a 90 degree humid day, the mini pump will often put me over the edge of dehydration. Plus my bike rider spindly T. rex arms have a hard time with the pump. |
Originally Posted by Spaghetti Legs
(Post 20636134)
I hat to use the CO2 because they are wasteful and expensive but on a 90 degree humid day, the mini pump will often put me over the edge of dehydration. |
Originally Posted by Road Fan
(Post 20635180)
No. It's news to me that CO2 actually isn't contained by butyl rubber, but it's not surprising that it is different from N2 or O2. The CO2 molecule has two oxygen atoms at roughly a 120 degree angle apart from each other, relative to the carbon atom. Hence it is polarized due to it's shape. N2 and O2 each have only two atoms of the same species, so they are not polarized anywhere so strongly. The polarization has to do with some kind of difference in how the protons and neutrons are distributed in the CO2. It's not uniform in any event and hence the molecule has what's called a dipole moment. This parameter affects mild chemistry issues like solubility and strong chemistry issues (in some materials) like what it will react with, at least for most molecules. CO2 is rather stable and hard to create a chemical reaction, in any event.
Somebody stop me! Who'd a thunk my college chem would have any use in bikie chatter********** |
Originally Posted by iab
(Post 20635812)
Colnago carbon. Full Campy EPS. Enve wheels.
Full dentist. Top |
fat tires, 40 psi will go all day for me. |
Originally Posted by Road Fan
(Post 20636033)
Being a gas it's compressible. I think it would be 22 liters (or whatever the number is for an ideal gas) at standard temperature and pressure, 20 C and ... whatever sea level atmospheric pressure. At 120 psi pressure in a tubular tire, that's a pressure of 8 atmospheres.
Mole of gas would be number of molecules, Avogadro's Number? Basically it's a standard mass, not of volume. I'll hazard a guess STP is 1atm so if we're talking 8atm you'd be stuffing 8X that mass into same volume Dayum, my teachers were wrong!! Sounds like one CAN learn via absorption/marination/immersion whilst sleeping in high school Chem class :roflmao2: |
Originally Posted by prathmann
(Post 20636420)
Sounds good, but where did your college chem class say that CO2 has a bond angle of 120 degrees? Each oxygen atom is attached to the carbon with a double bond in a linear geometry (i.e. 180 degrees apart). So CO2 is also non-polar, just like O2 and N2.
What I was thinking was that methane has the four H+ at the corners of a tetrahedron, and the angle between a pair of H's with the C at the vertex is around 120 degrees, so I just assumed it was the same for CO2 as for CH4. I'm sure you're correct that if they are double bonds the arrangement is linear and there's no dipole moment. So I am clueless why the behavior of CO2 is so different from O2 and N2. |
It so happens that I work for a company making gas analyzers. So I asked one of our chemists about it. He didn't know the explanation right away. But he pointed out that when we assemble analyzers with CO2 sensors we can't use the usual flex tubing but have to use stainless steel instead. Our immediate conjecture was that it would not be simple gas-phase mass transport. Rather, the oxygen atoms out on the wings of the CO2 molecule might have some sort of surface interaction with the carbon in the tubing. He promised to look into what the chemistry might be.
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