How much air does a scuba tank need?
The most popular tank is an aluminum tank that holds 80 cubic feet of air. A general rule to follow is that in most cases, the more air a tank holds, the longer it will last. You do need to call in the other factors, however, to determine if this will hold true in your case.
How long does 200 bar of air last?
If we use 20 litres a minute at the surface, a 15 litre cylinder containing 200 bar would last 150 minutes (15 X 200 / 20).
What is the typical pressure of the air in a scuba tank ATM?
The pressure in most commonly used scuba tanks ranges from 200 to 300 atmospheres. Gases are unlike other states of matter in that a gas expands to fill the shape and volume of its container. For this reason, gases can also be compressed so that a relatively large amount of gas can be forced into a small container.