How many billion people does oxygen have enough for?
(2 votes)
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According to the University of Hamburg, a person uses 250 mL oxygen per minute. This corresponds to about 257 g of oxygen per person per day.
The earth’s atmosphere has a mass of 5.2*10^18 kg. Of these, 21% are oxygen. So about 1.1*10^18 kg. Let us share this with the 257 g a value of 4.3*10^18 people (these are 4 trillions, i.e. 4 billion, so to speak). This value of course applies only if the amount of oxygen regenerates by plants or artificially every day.
Oxygen is not a problem at all if you only look at breathing. It is produced in exactly the amount necessary to burn the produced food.
Even if one burns so much coal that the oxygen content drops by one percent, from 21 to 20%, the carbon dioxide content increases from 0.04 to 1.04%, i.e. to 26 times, and then the oxygen content is the least problem.
The lower limit is more than 8 billion.