why is the pressure lower in high altitude areas compared to sea level areas? does this have anything to do with the fact that there's less oxygen in high altitude areas?
This is just my way of thinking about it, but P = F / A = mg / A so P is directly proportional to F given constant g and A. Pretend you're standing at sea level, and there is a big column of air (say with mass X) sitting on your head that extends all the way up to the earth's atmosphere. When you climb up on Mount Everest, you have a a smaller column of air on your head (say with mass (X - Y), where Y is the difference between sea level and Everest) so pressure, in the sense of what's "on your head", is lower. Let me know if that makes sense.
bernoull,
you said pressure proportionally varies with height, if that's the case, it contradicts my original question, which was that the higher your go up (high altitude), LESS the pressure. i'm really confused now.
I'm sorry for the confusing, I can see how the height can confuse, let me clarify...
Hydrostatic Pressure, which is what we are talking about here is given by
P=pgy
p=denstiy, g=gravitational acceleration (10m/s^2) and y=distance from fluid surface
If you have an aquarium, y is measured from the surface = depth basically.
For the atmosphere, its thickness is ~ 100km from the ground to outer space.. so you measure y from space. From space to the ground is 100km, height of everest is ~ 9km, therefore from space to everest is ~ 91km.
Having said all this, let find ground pressure and pressure at Everest's summit.
1. Ground: P=pgy= 100pg
2. Everest: P= 91pg
Pressure difference = 9pg.
In my first post I said P=pgh, what I failed to mention is that h is the difference between y1 & y2 (ground and everest)
So P=pgh = pg (100-91) = 9pg
In other words, h is the height/depth difference b/t 2 points and y if height/depth from fluid surface... As long as u calculate h or y correctly, you get da same result..
I'm hope ur less confused now..
Bernoull was correct. As you get higher altitude, the Y (column of air) decreases so this is why there is less pressure above.
does this have anything to do with the fact that there's less oxygen in high altitude areas?