How the oxygen percentage is maintained in the flights when they are flying above 35000 feets?
336478
I'm pretty sure they have oxygen tanks on board or they might have an intake valve somewhere outside the plane for the few oxygen atoms floating around up there but the oxygen already in the cabin from take-off should be enough for the flight itself.
889842
By limiting the amount of oxygen that can reach the muscles, altitude lowers average workout quality. Most athletes carry out both their continuous and interval workouts about 5-10 per cent less intensely at altitude, compared to sea level (here intensity is defined as speed of movement, not percentage of max heart rate). Interestingly, recent research suggests that altitude's slowing effects may begin to show up at elevations of only 2000 feet or so, far below the 4000-5000 feet mark which has usually been linked with downgraded performances. Training more slowly is hardly the way to become a better performer
722552
5 psi\n\nIt just seems like more at 30,000 feet.
846551
Adaptation of flight.
693642
The orbital velocity of the satellite depends on its altitude above Earth. The nearer Earth, the faster the required orbital velocity. At an altitude of 124 miles (200 kilometers), the required orbital velocity is just over 17,000 mph (about 27,400 kph). To maintain an orbit that is 22,223 miles (35,786 km) above Earth, the satellite must orbit at a speed of about 7,000 mph (11,300 kph). That orbital speed and distance permits the satellite to make one revolution in 24 hours. Since Earth also rotates once in 24 hours, a satellite at 22,223 miles altitude stays in a fixed position relative to a point on Earth's surface. Because the satellite stays right over the same spot all the time, this kind of orbit is called "geostationary." Geostationary orbits are ideal for weather satellites and communications satellites. \n\nIn general, the higher the orbit, the longer the satellite can stay in orbit. At lower altitudes, a satellite runs into traces of Earth's atmosphere, which creates drag. The drag causes the orbit to decay until the satellite falls back into the atmosphere and burns up. At higher altitudes, where the vacuum of space is nearly complete, there is almost no drag and a satellite can stay in orbit for centuries (take the moon as an example). \n\nSatellites usually start out in an orbit that is elliptical. The ground control station controls small onboard rocket motors to provide correction. The goal is to get the orbit as circular as possible. By firing a rocket when the orbit is at the apogee of its orbit (its most distant point from Earth), and applying thrust in the direction of the flight path, the perigee (lowest point from Earth) moves further out. The result is a more circular orbit
891219
The technology achieved in the race of air power is tremendous. How do you think that man has achieved to put over one million people in the skies at an altitude ranging from 29,000 to 44,000 feet continuously every hour on the hour? Is it not through having over 5000 airplanes continuously flying in the air as a result of understanding aerodynamics and behavior of air and the power that air may produce because of our understanding of its behavior extensively? The development of high bypass engines that produce 100,000 pounds of forward thrust through titanium blades shaped as airfoil to deliver considerable engine thrust for aircraft and lift for wings to carry over one million pounds of weight to safely cruise in the air with as little noise as possible by the latest Boeing 747 Jumbo jet which can easily and safely maneuver at an altitude reaching almost 10 miles above in the skies. Don't you think that this is quite an advanced technology reached from understanding fluids engineering. How about the achievement of the United States fighters that travels almost 5 times the speed of sound and cruise at a level over 90,000 feet. Isn't that quite an achievement developed by researches done to understand behavior of aerodynamics? Currently, General Electric is indulging in producing noiseless high by pass engines that delivers forward thrust exceeding 120,000 pounds. Can you imagine flying at 50,000 feet in the air with speed greater than the speed of sound and enjoying an environment quieter than your bedroom or inside your own home? What about Generating electricity by building windmills at remote areas unpopulated on Earth. How about compressing the air using electrical pumps with air flow to produce conditioned air suited for hot climates at home or office or inside your car or factory or almost any place. Isn't that an advancement made in the race of air power. I can go on and reveal to you how much advancement man has reached to subjugate the tremendous amount of air that we have in our planet to suit our peace and joy of life. Finally, consider the power of Hurricane that can lift up a whole city from the ground and result more damage to the areas on Earth that exceeds the damage that water had done during the Great flood of Noah.
829141
Higher partial pressure of O2 in atmosphere that that present in the blood.\n\nRemember, blood in the lungs will be DEOXYGENATED!
160161
True but...\n\nIn the Troposphere it is usually decreasing to about 40,000ft (in the mid latitudes), then in the tropopause it is generally stable, then above that I think it goes back up slightly as you get closer to space, then it gets very cold.  \n\nThe Troposhphere, Tropopause, Stratsosphere, etc are layers of air that have similar charistics.  I do not know them all but thats a littl more infor for you.
806472
Regular atmosphere(Ambient) air contains approximately 20.8% Oxygen.\nWhen a person is very weak they cannot breath well enough to get fresh Oxygen into the lung; therefore, Carbon Dioxide continues to buildup in the lungs and Oxygen falls below the level to sustain life.\n\nI am sorry that your Dad has passed away.
125609
I will rephrase the question to make sure I understand it correctly.\nWhat I think you're asking is that since the earth is travelling around the sun at thousands of miles an hour, how can a plane keep up with that speed to stay in the earths atmosphere?  \nIt is a very good question.\nI will give you a scenario:\nIf there's a fly inside your car sitting on the dashboard, and the car is travelling at 70 mph, will it crash into the back window as soon as it takes off from the dashboard?  \nThe answer is no because the air inside the car is also travelling at 70 mph, along with everything else inside the car.\nSo, the fly will be operating in the atmosphere inside the car.\nThe same holds true for the plane.  The earth's atmosphere is travelling thousands of miles an hour along with the rest of the earth.  Therefore, the plane is operating inside that atmosphere and will be carried along with it just like the fly in the car.
399830
They asked astronauts questions like this: "what if you had an oxygen leak and only had 10 minutes of air.  What would you do?"  The answer is "spend the next 10 minutes trying to find and fix the leak".\n\nSame thing for this question:  Try and survive any way you could.
845919
Gravity also decreases with altitude (since greater altitude means greater distance from the earth's centre). All other things being equal, an increase in altitude from sea level to the top of Mount Everest (8,850 metres) causes a weight decrease of about 0.28%. It is a common misconception that astronauts in orbit are weightless because they have flown high enough to "escape" the earth's gravity. In fact, at an altitude of 250 miles (roughly the height that the space shuttle flies) gravity is still nearly 90% as strong as at the earth's surface, and weightlessness actually occurs because orbiting objects are in free-fall.
496016
depends upon the environment.  Under normal conditions, a few hundred pounds will suffice to keep the diaphram from inflating the lungs.  In deep water, there are experimental blends that allow oxygen levels to be maintained.
227115
air is moved into the lungs
265374
The Federation Aeronautique Internationale has established the Kármán line at an altitude of 100 km (62 miles) as a working definition for the boundary between atmosphere and space. The United States designates people who travel above an altitude of 50 miles (80 km) as astronauts. During re-entry, 400,000 feet (75 miles or 120 km) marks the boundary where atmospheric drag becomes noticeable.
1053885
It is very beneficial to aeronautics as different layers of the atmosphere have different pressures and affect how a plane or shuttle flys.  Similarly a helicopter can only maintain its altitude within very low levels of the atmosphere.
147861
Fires need oxygen to burn.