there is less air pressure and the air is thinner so you need to breath in more of it then normal
The answer is simple when you are climbing and you are having trouble breathing is because you are in a higher elevation.
Nearly all climbers on Mount Everest have oxygen tanks to help them breathe more easily because the higher you climb the less oxygen there is in the air.
When you climb a mountain it gets harder to breath because the higher you get the less amount of oxygen there is and the more pressure. Your lungs are not used to that so it gets harder to breath.
As you climb a mountain, the air pressure decreases and the air becomes thinner. This can lead to a decrease in available oxygen, making it harder to breathe and causing symptoms of altitude sickness in some people.
Climbers use bottled oxygen on Mount Everest to help them breathe more easily because the higher you climb the less oxygen there is. At the summit of Mount Everest there is approximately 33% of the oxygen that is available at sea level.
The mountain is not said to be a techncal climb, it is the high altitude and lack of oxygen that makes it hard to climb.
As you climb a mountain the air gets colder.
Climb Ev'ry Mountain was created in 1959.
A mountain goat can climb to however high it wants to climb. That's like asking you, how high can you climb?
Because she can
The air is thinner, there is less oxygen molecules per volume of air (the air is less dense) therefore to absorb the same amount of O2 into your blood at 4000ft as at 0ft altitude you have to breath more/ more deeply. Also, you're climbing a mountain (going uphill) which uses more energy than going flat as you have to work against gravity.
No Mount Everest is not the hardest mountain to climb, there are many mountains that are very hard to climb.