Scuba Rebreather

is there an art to taken breaths while scuba diving?
when scuba diving because you have limited amount of air, how is the air inhaled in regards to the rate of breathing? is it done at a rate which is normal to that of being out of water like everyday breathing? or do you have to control your breathing and hold your breaths before inhaling again? does a person who is scared of water or deep seas use more air than a normal diver? lastly what is a rebreather is this different to scuba tank air? and if it is which method gives more time underwater?
Regarding breathing...
You want to breathe as normally as possible. I tell my students to try to breathe as if they are on laying on the couch watching TV.
Breathing normally will make your air last longer. If you try to alter your normal breathing pattern only while scuba diving, you will actually use more air because you are "thinking" about breathing. Just breathe normally.
If you are nervous, scared, anxious, etc. you will use more air.
Dive more often and you will be more relaxed. The more relaxed you are, the longer your air will last.
Regarding a rebreahter...
On normal scuba (open circuit), you inhale from the tank and exhale into the water.
On a rebreather (closed circuit), you inhale from the tank and exhale back into the tank. A little more specifically, you exhale into a scrubber and some oxygen is added back to the exhaled breath. You inhale this new mixture.
There is also a semi-closed rebreather which some of your exhale goes to the tank and some goes to the water.
Rebreathers will give you more time underwater, but they are very expensive to purchase as well as very intensive to maintain.
If you want more bottom time, dive more. If that does help, take bigger tanks.
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