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The rate of respiration decreases in water due to atmospheric pressure (similar to when you climb up a mountain, you cannot breathe easily).
If you're wondering why the shape of the container is cylindrical, it's to keep the water pressure even around it so that it doesn't break nearly as easily as a square one, for example.
They need oxygen to breathe. The tank allows them to stay down longer. New technology has brought us a 'Rebreather', and (soon) prosthetic gills.
See the related link listed below for more information:
Divers don't usually bring O2. The normal compressed gas in a divers tank is just compressed air. If a diver does bring pure oxygen, than that diver is going to extreme depths and needs to replace the increasing hydrogen in the blood stream with oxygen. If they are doing this this than hey usually have 2 tanks of compressed air, 1 tank of O2, and one tank of enriched air (helium and oxygen).
Correction:
The above is half wrong. The deeper a diver goes, the less oxygen will be in the gas mix (not more). Additionally, it is not hydrogen that is the problem, but nitrogen. When diving deeper, the nitrogen is replaced with helium. And enriched air is not a helium oxygen mixture, but air that has oxygen added so it is comprised of mostly nitrogen and oxygen. So the deeper the dive, helium will be added (and oxygen will be decreased) and only during decompression stops as the diver gets shallower will more oxygen be present and not until 20 feet (6 meters) will pure oxygen be used if it is a technical decompression dive.
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Why does the oxygen need to be comressed in a divers tank?
Oxygen needs to be compressed in a diver's tank to increase the amount of oxygen that can be stored in the tank. Compressing the gas allows divers to carry enough oxygen to sustain them while underwater for a longer period of time without the tank becoming too large and unwieldy.
What is the mixture of gases in a deep sea divers air tank?
95-98%helium 2-5% Oxygen
What is an aqualung?
An aqualung is a piece of equipment consisting of an oxygen tank and breathing apparatus used by divers to allow them to breathe underwater at depth.
Why do scuba divers need to bring oxygen tanks while fishes do not?
Because fish have gills and can breathe under water and humans do not
What is in scuba tank?
A scuba tank holds compressed air or a mix of gases, typically oxygen and nitrogen, that divers breathe underwater. The tank allows divers to stay submerged for extended periods by providing them with a continuous air supply.
How do scuba divers breathe underwater?
They don't breathe normally on their own.They have to use pressure regulators to breathe naturally, overcoming the extreme pressure deep underwater.A snorkel and oxygen tank help the divers breathe when they are underwater.
Is there a way of breathing underwater using a small oxygen tank with a directly connected mouthpiece?
yes, basically you're just saying what scuba-divers do
In an air tank like the kind used by miners and divers what purpose does nitrogen serve?
Nitrogen is used in air tanks to dilute the oxygen content, reducing the risk of oxygen toxicity for the divers or miners. This helps prevent certain health issues that can arise from breathing high levels of oxygen under pressure, such as seizures or respiratory problems.
Name something deep sea divers wear that you look silly wearing in a swimming pool?
Flippers Oxygen Tank Wet suit Snorkel Mask
Your dive tank has 3 year old gas in it is it safe to use?
The use of an oxygen analyzer would be advised. Most nitrox and technical divers have one.
How will astronauts get oxygen?
Their suits-similar to divers.
What item is a traveling oxygen patient not allowed to bring on an airplane?
Patients cannot bring or use their own oxygen tanks on an airplane; therefore the patient must leave his or her portable oxygen tank at the airport before boarding.
