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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
How do sea animal use buoyant force?
they use it to stay underwater without going up out of the water. They have adapted to 'float' in the water against the buoyant force.
Can some One with cardiomyopathy do scuba diving?
Sounds like "no".
Severe Risks
Venous emboli, commonly produced during decompression,
may cross major intracardiac right·to·left shunts and enter
the cerebral or spinal cord circulations causing neurological
decompression Illness. Hypertrophic cardiomyopathyand
valvular stenosis may lead to the sudden onset of unconsciousness
during exercise.
Is it safe to use old air in a dive tank?
Usually it is fine. Air has been filtered before being compressed in the cylinder, and it does not go "off". However, if it is a really really old cylinder, the cylinder itself may have deteriorated and may not be safe to use until it has been hydrostatically tested.
What is the term for rising or ascending too fast while diving?
It might be called "the benz,"
but there are several different kinds......
Addition
A very rapid pressure loss is known as explosive decompression. The question is about the ascent itself and not any consequences of ascending too fast. Also, simply ascending fast does not equate to a diver actually getting decompression sickness. The term decompression illness encompasses all diving pressure related injuries including those not related to ascending fast.
ADDITION
Decompression sickness/Decompression illness/"The
bends"
In scuba diving what is a bender?
"The bends" is a slang term for decompression illness. The term arose, no doubt, because one of the symptoms of decompression illness is severe muscle cramps, often causing the sufferer to involuntarily "bend" over.
When a diver descends, the gasses he breathes are delivered at higher and higher pressure. Under this increased pressure, the gasses that aren't metabolized, called "inert" gasses, are dissolved in the diver's blood stream and body tissues. For divers breathing air, the primary inert gas is nitrogen, since air is composed of about 79% nitrogen and 21% oxygen. The deeper the dive, and the longer the time at depth, the more nitrogen is dissolved into the body tissues.
Plop Plop Fizz FizzThis isn't generally a problem until the diver begins to surface. If the diver ascends slowly enough, the nitrogen is allowed to come back out of the blood and body tissues at a molecular level, just as it was absorbed, and there's no problem. If the diver ascends too quickly, however, the nitrogen can come out of solution more violently, forming micro-bubbles.We've all seen the carbon dioxide coming out of solution in a carbonated soft drink. That's not something you like to have happen in your body tissues. Severe decompression illness is analogous to shaking the soda can or opening it in the mountains. LOTS of bubbles.
In the case of decompression illness, the tiny carbon dioxide bubbles do two things: As the bubbles form around capillaries they tend to block access of oxygen to the cells, including nerve and muscle cells. This oxygen deprivation can cause cell death which is very painful and can leave lasting damage. More severe off-gassing of nitrogen can actually cause tissue damage by perforation of cell membranes.
The obvious way to prevent decompression illness is to either ascend slowly enough that no micro-bubbles are allowed to form, or to limit the amount of nitrogen saturation that can occur by limiting dives to shallower depths for shorter durations.
Long, deep dives can cause so much nitrogen saturation that a diver is unable to ascend directly to the surface and must instead stop at prescribed depths to allow body tissues enough time to release their nitrogen slowly. These "decompression stops" are not considered safe practice for recreational divers, which is why recreational divers are limited to depths shallower than 130 feet. Diving deeper than that while breathing air requires mandatory decompression stops.
The US Navy and other military organizations developed the first "dive tables" as guidelines to determine safe bottom times for various depths. All recreational dive training agencies publish tables based on either the US Navy tables or commercially developed tables as guidelines for how long it is safe for a diver to stay at various depths without unacceptable risk of decompression illness.
Digital DivingMore recently, small dive computers, usually worn on a diver's wrist or attached to a gauge console, have been developed to assist in this function. A dive computer is programmed with algorithms that simulate the on-gassing and off-gassing of various tissue groups throughout a dive (and across sets of multiple dives). Since the computer is exposed to the same pressure changes the diver is, it is able to predict with a fairly high level of accuracy, safe bottom times and rates of ascent -- thereby avoiding "the bends".Why does the diver wear a metallic cover while going into the sea?
Perhaps you are referring to a breast plate. A bp is what commercial divers wear that allows them to go under and work. Sport divers don't wear complicated gear. Commercial divers wear an outfit that protects them from a harsh environment. Hardhat, breast plate, suit, shoes, wt. belt, air line to the surface with unlimited air supply according to the depth they are diving at.
How long can you scuba dive for?
It depends what gas you are breathing!! Also you would know this if you are qualified to dive, If you are not qualified, but diving anyway... and you start seeing how deep you can go.... you will probably get "Narked" ..at around 30 metres . which is nitrogen narcosis . Its a feeling of being drunk under water ... great fun and if you are not with someone experienced, usually fatal... I am ex commercial diver ( Oil Rigs ) and have seen people narked...taking off their scuba gear and giving it to the fish so the fish could breathe!!! Hope you get the point... You will not know if you are narked... Only your buddies will spot the fact the you just FLIPPED!!
Join a club and get trained!!
www.PADI.com
See Joburg engineer dives to world record.(News)
What is the scuba diving decompression table?
It is used to plan your decompression so you do not come up with excessive nitrogen in your blood therefore giving you the bends.
The tables give you time limits at different depths where most people will not get decompression sickness. There are different tables out there, but all have the same commonalities, such as having short time limits at deeper depths and longer time limits at shallower depths.
You may also want to see a longer answer in the question "What does decompression mean in diving?"
Is scuba equipment and an aqualung the same thing?
No. Scuba refers to any form of Self Contained Underwater Breathing Apparatus. An aqualung is a type of scuba equipment, but a rebreather is also technically scuba equipment, as would any other self contained underwater diving rig. However, surface supplied diving is not regarded as scuba.
In common terms "scuba equipment" is often used as a generic term for diving equipment, so as to include non-breathing apparatus, like a diver's mask or fins.
What colored flag indicated scuba diving or snorkeling activity?
There are 2 flags, either of which can be used.
The international "A" flag which is white and Blue
The red-and-white dive flag
How do you deal with a hole in your eardrum from having tubes put in when scuba diving?
You don't. You can't dive this way. However once the tubes are removed (or absorbed ... I'm not a physician) and the holes heal (which they will), you should be able to dive. I say "should" since you probably need to know that the underlying problem for which you needed the tubes is also resolved. Any scuba class (in the US) will require you to fill out a medical form and you will probably need a doctors release to dive. However, it is only your doctor that can answer this question for you. But the simple answer is when you eardrum is healed with the tubes no longer being present, you should be able to dive sometime in the future. I included a link in the link section to the standard medical form used by the different certification agencies so you can present it to your doctor if you would like.
The maxium dive time for a dive of 60 feet is how many minutes?
60 feet is about 18 meters (the recreational limit for OPEN WATER CERTIFICATION) and the PADI RDP table states that 48 minutes will be the NO DECOMPRESSION time limit.
Regardless of how much Air you still have in the cylinder, you MUST NOT exceed this time otherwise you will require a DECO STOP. Unless trained in Decompression Theory and Technical diving the risk of a DCS/DCI is VERY high.
Be aware that hardly anyone would be sitting at 18meters CONTINUOUSLY for 48 minutes, unless you were working at that depth (in which case youd probably be on HardHat or Surface fed so this doesnt matter!!) which is why using a computer will show you your SAFE NO DECOMPRESSION TIME for the dive you are making.
Improved Answer
The above answer as it relates to the time limit is not correct. PADI's time limit for their table (the RDP) is 55 minutes at 60 feet and 56 minutes at 18 meters if you have the metric table.
Other tables use different time limits, but in general the time limit is considered to be 50 to 55 minutes at 60 feet with most "modern" sport tables being 50 minutes.
60 ft/18 m. time limits (in minutes)
DCIEM (Canadian): 50
British Sub Aqua Club (BSAC): 50
Buhlmann (Swiss): 50 (good to 2300' elevation)
Table researchers or developers:
Dr. Bruce Basset: 50
B.R. Morris: 50
There is an overall good consensus between the tables at the middle to deeper depths, but the times can vary a lot at the shallower depths such as 30 feet and shallower.
Deepest no limits free dive ever?
Belgian free diver Patrick Musimu dove to 209.6m in the Red Sea, that's 687ft people!
What is the maximum age limit for Saturation diving?
Frankly, speaking to all of you what i had been told by one of the saturation diver that the maximum age doesn't matter atAl's long our medical is pass and fit. Because some of the saturation divers in UK overthrow their ages is 65 years old there still doing the saturation diving. As long you all who get involve in saturation diving operation is fit for your medical fitness you can still continue the job. Kathi's is what i can share the information to all of you.
What company logo has man in a scuba suit?
I believe you are thinking of the PADI (professional association of diving instructors). This has a globe with a diver carrying a torch (representing education: lighting the world of diving)
What are the different grades of scuba air?
There are a number of different gases for diving.
Most commonly, air is used for recreational diving. Sometimes, nitrox is used which is a higher proportion of oxygen. This is usually 30-35% oxygen instead of the ~20% in air. This has the benefit of less nitrogen so less "on-gassing". This increases the bottom time and reduces the decompression stops.
For commercial diving, there are a number of other gases used such as Trimix which I believe has Helium in it.
huhu
What can you do to properly care for a scuba tank?
Store in a clean, dry, dark place when not in useType your answer here...
How does Jesse react to leslies essay on scuba diving?
- jess reacts to leslie essay because it was on scuba diving
What job will you have if you took scuba gear to work?
There are quite a few jobs where SCUBA gear is used. You might be a diving instructor but you could also be a police search diver, someone working in the navy, a marine biologist, an underwater photographer or perhaps someone looking after things underwater like boat moorings.
Does an objects buoyant force change when put in different liquids?
Yes it does, depending on the specific gravity of the liquid, and what makes the object "bouyant". I enquote this as a nitrogen blown wetsuit would not be bouyant in a Hydrogen atmosphere. I refer you to Archimedes on this one. [[User:Cjonb|Cjonb]] 00:27, 3 Jun 2008 (UTC)
