The air pressure values that you see reported are normalized to sea level equivalent. Go back to uhh, dude; if you cannot get is straight from that then you are a lost cause (and also someone NOT to listen to for this topic and probably others of a scientific nature).
empiricist wrote:
It seems to me you simply compare the typical or average barometric pressure in two locations to see if there is an effect. All the gravity and bulge talk is nice, but what IS the actual pressure?
Yeah yeah yeah... but, will the plane FLY?
your question is a very good one ...
in many cases, the answer is "no" due to "density altitude" - on a hot summer day, the air is less dense than on a cold winter day. airplanes are rated with a certain "ceiling" as a for instance, if you are flying from Boulder (~5500ft) to Winter Park (~9000ft) and you must fly over Corona Pass at ~12,000ft - if your plane has a ceiling of 13000ft - you may say "I have 1000ft of clearance" but ... if the temperature is warm enough, the density altitude will be much higher than 12000ft, perhaps even 13000 ft ... you will not make it to Winter Park, as more than a few novice aviators have discovered.
lol, i know torres' nephew. not exactly a running stud, though. :(
Jet Lag.
Actually I was making a joke about this thread:
http://www.letsrun.com/forum/flat_read.php?thread=1161075
Your science is obviously excellent.
Wow, amazing that a letsrun poster not only admits his/her mistake but backs the truth with the Department of Defense.
I personally found the DOD explanation much clearer than the other qualified scientist on this thread.
And, it is a fact, that while atmospheric pressure is the primary culprit in oxygen uptake at varying altitudes, gravity does have an effect on all atoms and molecules.
Not sure when Torres made the statement. But, if it was last winter before the XC Championships, I would venture it was much, much harder to run in Boulder! If you remember we had just received 6 ft of snow in the previous 30 days and most trails, roads, and bikepaths were solid ice. They werre running repeats on a country road that was about 50 percent ice and the one "warmup" race 2 weeks before was over a plowed path in the park with enough snow falling to cover up the ice and mud....Perhaps it was taken a bit out of context...
Again, the OP had it wrong, it wasn't Torres who made the statement.
yeah, yeah, I got it wrong, But it was Torres who pointed out that he wasn't a geologist and Carney agreed, "Yeah dude, were not geologist (followed by the dorkiest, funniest laugh I've heard)"
chasingglory.com (great site!)
Could it be that the reason it is harder to run at altitude in Boulder than in Mexico has to do with the company you keep? There seems to be alot of hot air in Boulder, maybe they used up all the oxygen.
Not sure about these theories.
wow, letsrun wrote:
And, it is a fact, that while atmospheric pressure is the primary culprit in oxygen uptake at varying altitudes, gravity does have an effect on all atoms and molecules.
Obviously you didn't read the thread fully. The differences in gravity are so small to have a negligible effect.
The altitudes cited here are much, much higher than 5,000 feet. Do you think there is as big of a difference at a lower altitude?
There is only a difference of 6% altitude for equal atmospheres between the summit of Mt. McKinley and the corresponding Himalayan height. I imagine at a lower altitude, this difference would be even smaller. Probably negligible.
Many Men wrote:
The altitudes cited here are much, much higher than 5,000 feet. Do you think there is as big of a difference at a lower altitude?
There is only a difference of 6% altitude for equal atmospheres between the summit of Mt. McKinley and the corresponding Himalayan height. I imagine at a lower altitude, this difference would be even smaller. Probably negligible.
The the differences in gravity are so minute that there would be no noticeable differences in gas concentrations caused by the differences in gravity.
Boulder 40’ Lattitude g
b= ???? m/s
2New York 40’ Lattitude g
ny= 9.802m/s
2g
ny/g
b= (r
b/ r
ny)
29.802/g
b= (6369.6km/6368km)
29.802/g
b= 1.00025126
29.802/1.0005 = g
b= 9.797m/s
2The pull of gravity at Boulder is 99.94899% compared to New York City. Translation: negligible
--------------------------
The Earths radius at the equator is 6378km. The differences in gravity at 5000’ at 40 latitude compared to 5000’ 0 latitude is:
g
e/g
b= (r
b/ r
e)
2g
e/9.797 = (6369.6km/6379.6km)
2g
e= (0.9968674)*(9.797) = 9.766 m/s
2The pull of gravity at 5000' on the equator is 99.968% of Boulder's gravity. Translation: negligible
------------------
The reason why running is easier at altitude at the equator than at mid latitudes is due to change in the pressure gradients, as already posted by a previous rocket scientist.
Thanks for the step by step proof. Torres felt the difference and knew there was a logical reason behind it.
bump
jbl1500 wrote:
Thanks for the step by step proof. Torres felt the difference and knew there was a logical reason behind it.
Once again, Carney was the one indicating that he felt it.
You all are trying to call out Torres for his comments but I think you are missing the point!
It is immaterial whether Boulder has less atmospheric pressure than Mexico City for a given altitude above mean sea level.
Torres is simply a dork for saying, "I don't know. I'm not a geologist dude!".
Meteorologists study the the atmosphere, not geologists!!!
High on some altitude wrote:
You all are trying to call out Torres for his comments but I think you are missing the point!
It is immaterial whether Boulder has less atmospheric pressure than Mexico City for a given altitude above mean sea level.
Torres is simply a dork for saying, "I don't know. I'm not a geologist dude!".
Meteorologists study the the atmosphere, not geologists!!!
You're dumb. A geologist would study both.