Question

What is the effect of altitude on atmospheric pressure

Answer 1

The average pressure at ground level is, roughly, one kilo per square centimeter. If you extend your thumb that is roughly a square centimeter, can you feel the weight of one kilo?

Of course not! Because the air is a fluid and presses from all directions, also from under. It is the weight of the air above you! And the higher you get, the less air there will be and the less the atmospheric pressure will be, right?

From sea level, the air pressure sinks by about one hectoPascal (previously known as, millibar) per eight meters of altitude. But it is not linear as, the higher you get, the lesser air there is above you.

Then, the big question: Is there less oxygen at altitude? Well … yes and no! The oxygen content of the air will remain roughly twenty percent, at any altitude. But to get a certain amount of oxygen into your lungs, you will need to breathe more because the pressure is less.

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Answer 2

At sea level you have the highest pressure of the atmosphere, as you gain altitude from sea level atmospheric pressure decreases. It decreases because of gravity, gravity becomes lower as you gain altitude. Why? Because higher gravity, at sea level compresses the atmosphere the most. If you take the atmosphere’s oxygen at sea level, you have more or less 21% which is oxygen. As you gain altitude the atmosphere is compressed less, more or less you lose 10% of oxygen for every 1000 meters of altitude.