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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 you go about calculating buoyant force?

This is fairly simple. First calculate the amount of fluid displacement of the object, i.e. it would displace 10 cubic feet of fluid if completely submerged. Next, determine the weight of the fluid, i.e. salt water weighs 64 pounds per cubic foot. This can be used to determine the upward or buoyant force exerted on the object by multiplying the displacement by the weight of the fluid. In this example, it is 640 pounds. To determine whether an object will float or sink, simply subtract the weight of the object from the buoyant force. In this example, if the object weighs 200 pounds then the object will float since the 200 pounds of the object is met with 640 pounds of upward water force, so the object weighs 440 pounds in the water (640 - 200 = 440). If the object weighed 640 pounds, then it would be neutrally buoyant in the water and would neither sink nor float and would stay where placed (assuming no water movement, etc.) ... and if it weighed more than 640 pounds, then the object would naturally sink since it weighs more than the force of the water pushing against it.

If there is a total of one liter of nitrogen gas dissolved in the body tissues at sea level how much would be dissolved in a diver breathing air at 99 feet below the sea after the tissues has equilib?

The tissues do not "equilib." Your body builds up more and more nitrogen until there is so much built up that you get Nitrogen Narcosis, and as you ascend you can (and if at depth way too long, will) have nitrogen bubbles form in your bloodstream. Also known as "The Bends"

That answer is not correct. Tissues do come into an equilibrium state known as saturation (just ask a saturation diver that does not incur longer decompression after being "saturated"). After a certain period of time (the exact time is up for debate), the body has absorbed (or released) all the inert gas (i.e. nitrogen) it can at that steady state depth. The answer to the question can be kept simple with an answer of 4 liters (due to being at 4 times greater pressure than the surface pressure), or complicated by taking into consideration the concepts such as partial pressure vacancy (a.k.a. inherent unsaturation or oxygen window) as well as other gasses not having a linear affect depending on the depth - which would then affect the nitrogen partial pressure or potential uptake. The answer was also not correct as to how nitrogen narcosis works as that is based on actual partial pressure and is not dependent on time.

How do you look under water without goggles?

Well, with just your eyes you can't but if you're above water and you don't want to get wet you take a big white plastic bucket, the heavy duty kind, you cut off the bottom of it replace the bottom with plexi glass and then you stick it in the water and you can see through into the water as long as you super glued the plexi glass to the bottom of it.

How many ounces in one cubic inch?

Ounces measure weight (mass). Cubic inches measure volume. You can't convert one to the other without knowing the density.

How far can a person dive under water before its dangerous?

Depends on whether you mean how deep or how far just beneath the surface, and if it's with breathing gear or by simply holding their breath. W/o breathing gear it's not really the water that sets the limit, but eventually the lack of oxygen. Lumping it all together staying shallower than 10 meters and shorter than one minute should be reasonably safe. If you're diving with breathing gear there are charts and computers that'll tell you what the safe limits are, but shallower than 10 meters is fairly safe even for that.

Without this noble lightweight the goodyear company would never have gotten off the ground and scuba divers would really be hurting and doctors might be unable to heal them?

The noble lightweight being referred to is neoprene, a synthetic rubber material. Neoprene was instrumental in the success of Goodyear due to its use in wetsuits for scuba diving, helping divers stay warm underwater. Neoprene's properties also make it ideal for various medical applications, such as orthopedic braces and supports, enabling doctors to treat and help heal injuries effectively.

What is the deepest man has gone underwater without breathing apparatus?

Nuno Gomes, a Portugese Man who's also a Portugese Footballer made it to 318.5m. He was trying to beat Mark Elliott who made a depth of 313m, but he had another goal which was to reach 320m Goals Easier Goal = Become the world's deepest diver by beating Mark Elliott at 313m (succeeded) Harder Goal = Get up to 320m (failed) You made a spelling mistake in your question. When you mean that kind of C, you say sea.

What percent of oxygen causes toxicity?

Partial pressure of oxygen of 1.6 will cause toxicity. If using standard air (roughly 20% O2) this equates to a pressure of 8 bar which is present at 70m.

In terms of the percentage of O2 which causes toxicity, it depends on the depth but a partial pressure of 1.6 bar is the toxicity threshold

What kinds of accidents can be occurred during saturation diving?

Accidents that can occur during saturation diving include decompression sickness (the bends), oxygen toxicity, barotrauma (ear or sinus squeeze), hypercapnia (excessive carbon dioxide in the blood), and equipment failure. These risks are heightened due to the complexities and pressures involved in deep-sea diving over extended periods of time.

Why is a scuba diver's air tank placed in a tub of water when being refilled?

Because compressing a gas increases its temperature. The increase in temperature increases the pressure further. By cooling the tank in water the tank can be filled with more air, it's also safer than having a very hot super high pressure tank at the end of the fill.

Which is better Steel or aluminum dive tanks?

Steel has been used as a tank material since the begining of scuba diving. Extremely durable and useful as a tank material but steel rusts. Buy a steel tank, assume that over the life of the tank it will cost you for a few tank tumbles to remove interior rust. Pay more for a steel tank than an aluminum one. Steel will last (almost) forever if you take care of it. There are steel tanks still in service today that were originally manufactured in the 50s.

Aluminium tanks came out in the 70s. It's a softer material, the walls of aluminum tanks are thicker, making them a little larger than steel tanks of the same capacity. The big advantage of aluminum is that it doesn't rust and it's less-expensive than steel. You can find aluminum tanks cheap, for $100-150.

What will happen if you fill your wetsuit with air?

Assuming you are talking about a wet suit and not a dry suit, nearly nothing. Your suit will dispel the air as soon as you put it in the water. How fast depends on how deep you go (pressure) and how long you are there. Mainly it will be no different then when you put on your wet suit for your first dive of the day when the suit was dry. I do not understand why you would fill your wet suit with air other then possibly it being too loose. If that is the case get one that fits better.

What is a good wetsuit for 60 degree water temperatures?

A lot of personal preference comes into play. I would try either a 5mm farmer john, or a 7mm one piece. I found for myself if I'm diving wet around that temperature I'm comfortable in a 5mm farmer john wet suit with a 2mm lycra.

Why does water pressure increase as you dive deeper?

Water has density and weight. The deeper you dive the more water you have pushing against your body. Think of it like this young padawans: You place a book on your head, no big deal. For every foot that your imagination takes you deeper on a dive add one book. Is that stack of books getting heavy yet? Well if you imagined yourself diving to 130' (FSW) then that stack of books would have weighed in at 130' x .445lbsPerSqInch (book/foot) = 57.85 lbs. 130 being the depth of water in feet salt water (FSW), .445 being the weight of one foot of salt water (one book). The answer is the weight of water (books) measured over the area of one square inch. When you dive, you have the weight of all of the water over you, plus the weight of the earths atmosphere exerting pressure on you (the atmosphere is often neglected, but is of importance). The example of the books that I used is a little innaccurate though. In that example the weight is only being placed on one square inch of your head. In diving however, that force would exist over every square inch of a divers body. You can see how these numbers can add up, and you would think would severely limit the diver. However the body is primarily fluid which is not compressable. Those parts of the body which are compressable (Sinuses, Middle Ear, Respiratory tract, Lungs) are easily equalized with ambient pressure through training and or past experience. If you are wondering how I know what one foot of sea water weighs per square inc h, simply multiply .445lbs (one foot SeaH2o) times 144 (inches in a square foot)= 64 lbs which is the equivalent to the weight of one Cubic foot (ft3) of sea water.

How does an underwater rebreather work?

Basically, when you breathe in air from regular SCUBA gear, only about a fourth of the oxygen you breathe gets inhaled. So in a rebreather, the rest of the air and the carbon dioxide goes through a scrubbing system of calcium and sodium hydroxide. Then it goes through the rest of the loop and you breathe it in again.

Where can one go to take free diving lessons?

One can go to take free diving lessons through Australian Freediving Academy and Open Freediving course in United Kingdom. Free diving is also available at a South Florida diving school.

Is scuba diving in mid air possible?

seriously? it is not diving and you don't scuba to breath in air.

What careers are there in scuba diving?

Dive into the finest scuba diving experience at Rasdhoo, Maldives! Our diving experts have tremendous experience assisting people in experiencing life under the sea. Rasdhoo Diving is not only a magical experience but an entry ticket to a whole new world. You may as well learn from the best in the Maldives. We at Jerrys dive club specialize in scuba Instructor training and have a range of full and part-time programs to accommodate anyone interested in experiencing scuba diving. We also train scuba divers who wish to take up scuba diving as their career.

How deep can go scuba diver with breast implants?

Implants do not affect the ability of a diver to descend deep.

What can a scuba diver purchase from the Air Hog online shop?

A scuba diver can purchase many things for scuba diving at the Air Hog online shop. They can purchase dive knives, dive lights, dive computers, and dive bags which will help them in scuba diving.

Is scuba diving a good way to explore a ocean trench?

No.

Ocean trenches are deep, really deep. Scuba equipment won't let you dive anywhere near deep enough.

Who uses a scuba-suit?

Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.