breathing air

[gotcrypt]

when breathing air what percentage of oxygen at 44 ft of salt water and nitrogen at 44 ft salt water, would it be 20.9% oxygen and 78% nitrogen

 

[Thalassamania]

when breathing air what percentage of oxygen at 44 ft of salt water and nitrogen at 44 ft salt water, would it be 20.9% oxygen and 78% nitrogen

The percentages never change. The partial pressures change. at 44 feet the partial pressure of oxygen is 0.209 * ((44/33)+1) and nitrogen is 0.78 * ((44/33)+1).