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Scuba
S.C.U.B.A. = Self Contained Underwater Breathing Apparatus. Here is all the information you need to learn and be safe while enjoying this great sport. Explore the last frontier and uncharted depths in the S.C.U.B.A. category.
999 Questions
Can you tell if a cylinder is full or empty depending on its weight?
Yes. Not sure on the exact weights (as it depends on size of tank and pressure of the gas) but you can tell a definite weight difference between an empty and full tank because the compressed air does have a weight
a device for controlling the rate of working of machinery or for controlling fluid flow, in particular a handle controlling the supply of steam to the cylinders of a steam engine.
What is the formula to find displacement needed to lift an object weighing for example 3000 pounds?
Are you talking about the displacment needed to lift 3000 pounds in water? The total displacment would need to equal the weight of the object AND the contianment vessel AND the entrapped air. Water weighs about 8 (fuel is 6) pounds per gallon. So you'd have to divide the total weight of all objects by 8 pounds to find the displacment. Recognize that you can also count the displacment of the object being lifted as part of the total displacment, so if the 3000 pound object displaces 100 gallons of water, that reduces the total additional displacent by 100 gallons.
What is the best brand of scuba diving wetsuit for very tall very thin people?
The short answer to this is: the one that provides the best fit. All manufactures have different fitting suits. I am 6'6" tall, so I have dealt with this problem most of my life. I now dive with a dry suit as they are much more forgiving for sizing.
If you plan to dive in warm water only, I would look towards Hernderson, and Mares. I own suits from both of these companies and they fit pretty good.
Other than that, a full custom suit is a little more pricey, but well worth it in the long run. Most all suit manufacturers will custome make their suits.
What happens to divers who go deep?
Going deep has several effects on a diver:
- The diver will consume her breathing gas at a faster rate, because each lungful of breathing gas is at greater pressure. A diver at 60 feet will breathe roughly 3 times as much gas as a diver at the surface. A diver at 130 feet will breathe roughly 5 times as much gas.
- The diver will start to suffer narcosis at deeper depths. For divers breathing air (the most common breathing gas) or nitrox, narcosis usually starts to become noticeable at about 100 feet. Divers breathing helium mixes can get much deeper. Narcosis slows the mental and physical reactions of the diver.
- The diver's body will absorb gases from her breathing mixture at a faster rate. If the diver stays deep enough and long enough, she will have to perform decompression stops before ascending to the surface, or risk injury (or even potentially death) from decompression sickness. Divers normally use tables or dive computers to stay within no-decompression limits.
- At deeper depths, more spectrums of visible light are absorbed by the water. Accordingly the deeper you go, the more everything will start to look blue and green. The total light is also reduced, and so in low visibilty conditions, torches may be need once the diver descends to a certain depth.
- At deeper depths the water is colder and so the diver will also get colder, faster.
- Because the breathing gas is more dense at depth, breathing resistance will normally increase. Divers intending to dive deep usually use high performance regulators and/or helium mixes (which is a less dense gas) to reduce the effects of this. Divers have to be very careful not to exert themselves at depth (which breathing resistance can contribute too), as they can suffer from increased CO2 retention which can lead to hypercapnia.
- If the diver is diving an oxygen rich mixture, such as nitrox, the diver can be at risk for oxygen toxicity. Divers using nitrox are trained how to avoid this. It is theoretically possible, although highly unlikely, that a diver breathing air could suffer oxygen toxicity if they went deep enough.
What is the deepest depth ever dove by a human?
A human named Nuno Gomes dove 1044 feet below the surface of the ocean.
Why do divers fall backwards from a boat?
Divers fall backwards from a boat because it is often the easiest way to make a deep water entry from a small boat or rib.
Assuming that by 'amateur diver' you mean a recreational diver without any professional qualificaitions, the recommended limit as determined by PADI (Professional Association of Diving Instructors) is 18m (60ft) for an Open Water diver, 30m (100ft) for Advanced Open Water and 40m (120ft) for a Divemaster. BSAC (British Sub Aqua club) sets the limits as 20m (67ft) for an Ocean Diver, 30m (100ft) for Sports Diver and 50m (165ft) for Master Diver. So in answer to your question, no, you couldn't 'swim where the water pressure is more than 65 ps' unless you were a technical diver or a BSAC qualified diver, as at 165ft the pressure is around 69ps.
Need to find a store in or around Ocean City, Maryland that sells scuba dive equipment and gear?
There is a store called Scuba Dive that sells equipment and gear in Ocean City
How do you treat hyperventilation while scuba diving?
If someone starts to hyperventilate when they are diving this is generally because they are inexperienced and are anxious. It can also be because of heavy exertion or in some cases incorrect breathing mixture. It can be set off by something as simple as water leaking into the mask or not being able to control buoyancy. It is normal for inexperienced divers to get excited and use up their air at a high rate. Experienced divers should always monitor the contents of less experienced divers cylinders as the dive duration is always set at the person who will use their air first. When fast breathing becomes hyperventilation is a bit of a moot point but is generally considered to be when partial pressures of CO2 drop and the blood becomes saturated in oxygen.
At depth it may cause greater problems than on the surface where you might just get light headed. There is no way of treating it (like you may have seen in the film The Abyss) for normal SCUBA gear, although there may be ways to influence it with rebreather equipment. The best approach would be to carefully and slowly help the person to the surface, conducting required decompression stops as they will be using a lot of air and their dive time will be rapidly reduced. Keeping eye contact will probably help (unless you are really ugly!) and being on hand to control the ascent and ensure that person does not rocket to the surface is a plus.
What should you do if you experience discomfort in your ears upon descending?
If you are already using the Valsalva maneuver and your ears aren't equalizing, you should make sure you aren't sick and probably go to a doctor to get cleared for diving.
Are oxygenated fluorocarbons used in scuba diving real?
oxygenated fluorocarbons are indeed real and experiments have shown that you can place a mouse in it and it will stay alive however it is not easy to get the fluid out of the lungs afterwards. As a result it is not used for humans in scuba diving in the way it has been portrayed in things like the film; the Abyss. For one thing it would be hard to fill all of the gas pockets in the body, such as the sinuses and pressure on the body would also effect how various physical processes take place. These would probably limit the depth a diver could achieve even if oxygenated flurocarbons were used.
What kind of watch is Russian Diver?
Russian Diver watch was originally created to honor the 1959 watch commissoned by the Russian Naval Fleet. The original diver's watch was produced by the Slatoustowski factory.
SCUBA is an acronym for self contained underwater breathing apparatus.
the idea of scuba started with people using any type of breathing devise to breathe while swimming underwater, but the most well known creator of scuba is Jacques Cousteau who was apart of the French NAVY. He created the Aqualung in 1942 which was the first device to allow people to swim underwater for many hours. This device is the inspiration for the modern equipment of today.
How many meters below sea level is 1 ATM?
1 ATM is actually equal to mean sea level itself. Now if you filled a balloon with air and put it under the water, you would notice that the volume will decrease. This decrement will increase as you go further down. Since the volume is decreasing, pressure must be building up inside (PV=nRT), assuming that the temperature doesn't change. Thus undersea pressure will be higher than 1 ATM.
Addition
For water pressure alone, 10 meters of water is equivalent to 1 atmosphere of air pressure.
How is the quality of a pearl diver is judged?
they can change the pressure on their body to help them from drowning
What problems are there for people making deep sea dives?
Normally there is a risk of the bends (hydrogen bubbles building up in the blood stream)
Correction:
The above is incorrect. Decompression sickness (or the bends) is caused by gas bubbles comprised mostly of nitrogen (not hydrogen).
What does spg stand for in reference to scuba diving?
In reference to scuba diving, "SPG" stands for "Submersible Pressure Guage", which tells you how much air is in your tank so you can resurface before going too low on oxygen.
