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First, understand the the percent composition of air does not change at 8000 ft.
The oxygen, which is what you need to stay alive, is 21% at sea level and at 8000 ft.
The density of air is what decreases as you get higher. So even thought at 10,000 feet the air is still 21% oxygen, a given breath of air, contains so few oxygen molecules that you cannot stay mentally alert. Think of a breath of air at 10,000 feet as very dilute air, with lots of empty space between the molecules.
Now many jet airplanes pressurize to 8000 feet which is where that number mostly likely came from in the question.
The question asks about the percent of air at 8000 feet. If we assume no humidity and we assume temperature of 70 degree ( both those things affect air density so we need to pick some levels and those are reasonable and easy for the calculation) the air density is .0554 lbm/ft3 . The density at 0 feet given the same conditions is .0745lbm/ft3
We can look at the ratio of .0554/.0745 is about 74% so the percent of "air" is about 74% at 8000 feet if we use 0 feet as 100%. If we use 30% relative humidity for both 0 and 8000 feet, the percent does not change.
There is a link for calculation air density attached to this answer.
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∙ 11y ago
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Air miles vs miles?
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What percent of the outdoor air is oxygen?
21 percent
How many acres make 8000 sq ft?
1.51 repeated
How many known gases are there?
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What is 15 percent of 8000?
8000 * 0.15 = 1200
What is 47 percent of 8000?
47 percent of 8000 is 3,760
What is 7900 percent out of 8000?
To calculate 7900 percent of 8000, calculate (7900 / 100) x 8000.
How many square feet does an 8000 BTU air conditioner cool?
around 400 SF, not ft
How many squared meters in 8000 squared feet?
1 ft = 0.3048 m (exactly) ⇒ 8000 sq ft = 8000 x (1 sq ft) = 8000 x (1 ft x 1 ft) = 8000 x (0.3048 m x 0.3048 m) = 743.22432 sq m ≈ 743.22 sq m
What is the 10 percent of 8000?
10% of 8000= 10% * 8000= 0.1 * 8000= 800
What is 13 percent out of 8000?
13% of 8000= 13% * 8000= 0.13 * 8000= 1,040
What is 2 percent of 8000?
2% of 8000 = 2% * 8000 = 0.02 * 8000 = 160
How much is 20 percent of 8000?
20% of 8000 = 20% * 8000 = 0.2 * 8000 = 1600
What is 58 percent of 8000?
58% of 8000= 58% * 8000= 0.58 * 8000= 4,640
What is 80 written as a percent?
80 written as a percent = 8000% 80 * 100% = 8000%
What is 33 percent of 8000?
8000 * 33% = 2640
