I think this is nonsense.
According to an article published in the Journal of the Brazilian
Chemical Society, the thermal conductivity of oxygen is 2.8 k (W/m
K)10(-3). And amazingly enough, the thermal conductivity of nitrogen
is 2.8 k(W/m K)10(-3). So guess what the thermal conductivity of air
is going to be. I would estimate that it is approximately the average
of those two numbers weighted by the percentage of each gas in air.
Another source cites:
Air 0.026
O2 0.027
N2 0.026
Once again, air and nitrogen exactly the same.
Yes, some gases do conduct heat better than others. As a retired steel
engineer, I'm familiar with using hydrogen in the atmosphere gas of
annealing furnaces.
Finally, for those still claiming air and nitrogen expand at different
rates, I pull out my old copy of the CRC Handbook of Chemistry and
Physics (a book I had forgotten was still in my library).
The Coefficient of Expansion of Gases at a Constant Volume (that fits
a tire perfectly);
Oxygen --- .003672
Nitrogen-- .003672
Air ------ .003665
All measured at the same temperature and pressure. Not a very big
difference, and if anything, it favors air.
So, Fred, I guess I did go back to school as you suggested. And guess
what? They're still teaching the same things I learned way back then.
Les
--- In Diesel-RVs@yahoogro
>
> Russ, All gasses expand when heated but not all gasses conduct heat
as well
> as others. Something called coefficient of conductivity! Think of how
> quickly a piece of copper gets hot when heated compared to a sheet of
> asbestos that is the same size! Gas have a similar property... At
> nitrogen's molecular level they just need a lot more energy to get them
> moving which is what causes the heat!
>
> Fred
Off-topic posts will be removed.
Please sign with your name (real or online name) and include the RV model you have.
To unsubscribe from this group, send an email to
Diesel-RVs-unsubscribe@egroups.com
Earn your degree in as few as 2 years - Advance your career with an AS, BS, MS degree - College-Finder.net.
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
__,_._,___
No comments:
Post a Comment