Let's say a man of approximately 6', 180 lbs. has been put into a bubble, one that gives him no room to move around. He has only the air that came with the bubble. The bubble formed around him and trapped existing Earth air with him. If you sliced the bubble in half, it would be 10 feet across. There is an air gauge within the bubble, digital, telling him how much air he has (lbs. of air pressure? what would be the designation?) along with the # of hrs., minutes of breathing he has left. What would the reading be on the dial to begin with? Any information you can give on the various stages, i.e. when he begins to hallucinate (# of air pressure, time remaining), I would appreciate.

Yes, I'm writing a story. Thank you.