The method is the same, but the formula differs depending on whether you want it in meters or feet.
The easy method in feet is to add .3 atmospheres (ata) every 10 feet (or every 3 meters) and then add a surface atmosphere, so 20 feet would be:
[(.3 x 2) +1] = 1.6 ata
The simple formula for feet is: (Depth + 33)/33
For meters it is: (Depth +10)/10
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The method is the same, but the formula differs depending on whether you want it in meters or feet.
The simple formula for feet is: (Depth + 33)/33
For meters it is: (Depth +10)/10
Atmospheric pressure is the amount of force the column of air above you is exerting on you. At sea level you are considered to be at one atmosphere of pressure. Because Air is affected by the un-even heating of the Earth and the Earth's rotation we get high and low pressure systems that create different types of weather. Air will try and even it's self out and will always move from areas of high pressure to areas of low pressure.
In Scuba diving you experience water pressure instead of air pressure. At 10 meters (33 feet) you experience 2 atmospheres of pressure. This will increase by about 4.4 psi for every 10 feet or so depending on the water (fresh or salt ?)