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Normal divers use compressed air in their tanks. On special deep dives to extreme depths, there are other combinations of gases that are used, always including oxygen, as it is required by the human body to survive.
Addition
In general it is normal air for recreational scuba diving. But oxygen can be added so it is now common to have oxygen enriched air (or nitrox). Oxygen itself is not the benefit in nitrox. The benefit comes from diluting the amount of nitrogen (due to the addition of oxygen) that is being breathed since nitrogen is the gas that causes decompression sickness.
Air is a gas in diving cylinders.
All gasses will turn into a liquid if they are under enough pressure or if you make it cold enough. Butane in gas bottles tuns to a liquid at low pressures, so 'gas' in those bottles is a liquid. This makes them run a long time. In cold weather is is often impossible to get gas out of them because it wants to stay as a liquid.
Air in diving cylinders is generally less than 300 bar which although a high pressure is a much lower pressure than would be required to turn air into a liquid. You would also have to make it awfully cold to make it into a liquid. Even if it were possible to make it cold enough or put it under high enough pressure, to store the air as a liquid, it would cause problems for the diver. Not only would the cylinder be immensely heavy but the air changing state from a liquid to a gas and dropping to a breathable pressure would make it very cold in indeed.
no oxygen is... heres my question, how did you come up with that question!?!?!?!?
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What has gas pressure?
Anything pressurised with gas - an auto tire for example, or a scuba diver's air tank.
Why does a scuba diver need increased gas in the air tank?
Scuba divers require increased air pressures in their air tanks while diving because the pressure on their bodies increases.
What type of gas is in a scuba diver tank?
Air...Sometimes Have Abit Of Oxygen In..But Most Of The Time Just Normal Air.
You want to convert a SCUBA tank for use as CNG tank?
the silly answer is you can store anything in a scuba tank that you can get in it!!. BUTthe serious answer is scuba tank were designed for compressed air and nothing else... using a scuba tank for natural gas is like driving around with a bomb in your car!!, the valves and collars of the bottles are not strong enough if there was a crash
Are gas tanks air tight?
Gas tanks are designed to be air tight, because gasoline is a volatile liquid and you do not want it to evaporate out of the tank. Of course, a gas tank can be damaged, and may cease to be air tight.
How would the pressure inside a scuba tank filled with gas change if the tank were heated?
The pressure will increase
Why is LPG heavy when inside the tank?
LP gas is liquid in the tank. It is the evaporation of that liquid that produces the gas. LP=Liquid Propane, or Liquefied Petroleum
What is a container for liquid or gas?
tank
What is air solid liquid or gas?
gas
Is there scuba masks with oxygen in them?
Scuba masks do not contain oxygen. Instead, scuba divers rely on a separate piece of equipment called a tank or cylinder to supply compressed air or a breathing gas mixture for underwater breathing. The scuba mask's purpose is to provide a clear field of vision and to create an airspace for the diver's eyes and nose while underwater.
What gas is in a gas tank?
LPG, NAT, Manufactured, Liquid.
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.
