Oxygen content of the atmosphere

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I'm not sure if this is the best place to post this question, but here goes.

 

I'm trying to find out the percentage of oxygen content in the atmosphere for a given temperature, altitude and relative humidity and how that oxygen content percent changes as the temperature changes (with the relative humidity percentage staying the same)

 

the fixed relative humidity is 53%.

the altitude is fixed at sea level.

 

 

thanks

 

Andrew.

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i should add that atmos pressure is a constant as well