A diver can always stay as long as they want if they have enough gas to breath and do any required decompression. But if you are asking what the time limit is on air without having any required decompression time, the answer would be about 5 minutes which includes your descent time or about 3 minutes on the bottom.
they need to know how long they can be underwater, and how deep they can go with the air in the tank.
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.
People scuba dive because it enables them to stay underwater much longer than they would be able to do so without breathing apparatus. SCUBA stands for self contained underwater breathing apparatus. It is different from surface feed or Hooka diving where air is pumped down because it gives you more freedom. People have been able to hold their breath for up to 8 minutes but when you move about you can only hold your breath a short time. Taking an air supply means you can spend a long time underwater without being restricted by an air pipe from the surface.
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:
Not necessarily. It just depends on what someone means. Scuba diving is only when you use a scuba tank or cylinder that a diver carries. Deep commercial divers will often get their breathing gas supplied to them through a long umbilical hose ... so they are attached and do not carry Self Contained equipment that they can swim with like a SCUBA (self contained underwater breathing apparatus) diver.
An underwater mp3 player can work with no hassle underwater so long as you do not go beyond 5 meters or 15 feet underwater in which the sound frequency would get messed up.
Depends on the resistance. As long as it conforms to ISO6425 standard, you should be ok.
I will assume you are not joking. A fish does not hold it's breath it can breathe underwater using its gills.
Depents on what depth your at and your personal breathe rate, typical 30-60 Mins at 25 meters,
As long as he wants if he has enough gas to do the required decompression. But if you are asking what the no-stop time limit is, it doesn't exists since any dive to 100 meters (328 feet) requires mandatory decompression.
Fast courses in vacation spots take 4+ days. Traditional courses take several weeks. It's best to get proper and quality training if you're going to swim underwater for long periods of time.
Without breathing, the world record is 22min With air bottles (scuba diver) or in a submarine you can of course stay longer. In a submarine when you have enough supplies, you can stay virtually forever under water.