by 
Max Power
ANSWERS: 2
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atmosphere/atmospheric (pressure)
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eHaveagreatday nailed it, I can only add that one atm is equal to approximately 14 pounds per square inch and that the pressure changes for atmospheres occur at an intervals of 1 atm change per 33 ft of depth. So, at a depth of 33feet, the pressure exerted on us is that 1 atm PLUS the 1 ATM already present at the surface for a total of two atm. At 66 feet, we're under that surface atm plus another 2 (66 divided by 33) for a total of 3 atm. And so on. We use this information to for a lot of things. It help us calculate out total allowed time at a certain depths before we have to worry about scheduling decompression stops, it helps us determine what gas we can or cannot use for a certain depth when used in calculations determining partial pressures of oxygen exposure (oxygen toxicity) and for doing calculations regarding multiple dives to figure out our time needed to spend at the surface between dives to off gas any nitrogen load we may have accumulated in our blood and soft tissues.
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