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To fit more in. If it was at 1 atmosphere of pressure it would be like breathing out of a bag. (You would run out of air in about 5 or 6 breaths) Addendum: I should add that it's not oxygen in Scuba tanks; it's air. Oxygen when delivered under pressure, can cause convulsions. You'll never see a diver with oxygen in her tanks.
The above is correct, however oxygen is used by technical divers during decompression at very shallow depths. But this is not what is in the divers main gas or bottom gas.
Because that is what the air that we breathe is made of. (See Below) SCUBA divers can and do make mixtures for various gases (including adding Helium - see http://www.lakesidepress.com/pulmonary/books/scuba/sectionl.htm for details) See WikiAnswer http://wiki.answers.com/Q/What_is_the_composition_of_air Nitrogen (N2): 78.09%
Oxygen (O2): 20.95%
Argon (Ar): 0.93%
Carbon dioxide (CO2): 0.038% Others (less than 0.002% each): Neon (Ne), Helium (He), Krypton (Kr), Hydrogen (H2), Xenon (Xe).
Nitrox/Trimix Nitrogen is not added to a scuba cylinder. Instead, it is simply present in air. Oxygen is added (as well as helium on occasion for a "trimix") to dilute the amount of nitrogen in a scuba cylinder. Oxygen is used since it is needed to survive as well as a decompression gas for technical divers. It is used in this case since 100% oxygen means no other gasses are being breathed - which allows other gasses built up during the dive to be eliminated faster during the breathing cycle and thus decompression time underwater can be reduced. dude... unless the questioner understands the concepts, principals and application of Partial Pressures, Decompression Theory, Oxygen Toxicity and Nitrogen Narcosis your answer is not what he is asking.
Nitrogen and Oxygen are present in normal air we breathe every day along with other elements. Nitrogen makes up about 78% of the air and oxygen about 20%. Other elements include argon, boron and some others but these make up about 2% between them.
Normal air is used in SCUBA tanks as it is the air we are used to breathing. This does have certain limitations in SCUBA diving and due to the high amount of nitrogen which means that the body takes on nitrogen much faster.
In response to this, some divers use special gas mixes called Nitrox which have a lower amount of Nitrogen but higher Oxygen content which in turn means that divers can get more bottom-time.
There are other gas mixes which some specialist divers use such as heliox, trimix and in some cases pure oxygen but these are all used more rarely and not so much in recreational diving
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What is the percentage of body weight to weights used in scuba diving?
What is the percentage of body weight to weights used in scuba diving?
Why only oxygen is not used in tanks of scuba divers?
Naturally the air we breath has 70% of nitrogen and only 21% of oxygen, this is done is scuba diving as well. Just oxygen is not enough for living, while oxygen is essential one.
How was scuba diving used in World War 2?
they used scuba diving equipment to scuba dive. they used a person and put them in the equipment to scuba dive. scuba diving was cool because all the people didnt want to do it but did it anyway because cool people always do things like that.
What is the name of a compressed air cylinder used in skin diving?
Divers (and others) call the compressed air cylinders used by divers tank(s) or SCUBA tank(s).
Where can you get scuba tanks refilled other than at scuba shops?
You could buy your own portable diving compressor, my dive buddy has one, there not silly expensive . You must get fills from a compressor designed for diving (breathing) as the air is filtered and moisture removed.
Where is scuba diving gear used?
Underwater!
How is the frog like a scuba diver?
Well, it needs oxygen like a human scuba diver but it lasts a pretty long time underwater just like a human would if he used an oxygen tank.
Who founded the scuba diving?
Emilie Gagnan and Jacques-Yves Cousteau developed the first commercially used scuba equipment.
How can pure oxygen be used for the benefit of mankind?
Pure oxygen can be used in medical treatments to support patients with respiratory issues, in scuba diving to prevent decompression sickness, and in industrial processes like steelmaking and water treatment.
What job growth does scuba divers have?
It can be used as an introduction for commercial diving. The way to make a ton of money scuba diving is to start out with 2 tons of money! You can get a job at a resort. But the competition is fierce.
Who started scuba diving?
The History of Scuba diving goes back through the centuries People have been diving underwater throughout the ages, probably for as long as people have been swimming….. It may not have been Scuba but it is the beginnings of the quest throughout the history of scuba diving to be able to dive underwater and be able to breath underwater. There are records, in some cases little more than myth, of the methods used and what was done while diving. Read more at this site:
What is a harness used for in scuba diving?
a harness is a weight belt that you wear like a jacket
