0_Wizard
I've always wanted to go scuba diving. When I was a kid I used to pretend I had scuba gear and stay under as long as possible.
Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater.
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Scuba diving
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Scuba diving
Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a regulator.
Scuba skills
Scuba skills are the skills required to dive safely using self-contained underwater breathing apparatus, (scuba). Most of these skills are relevant to both open circuit and rebreather scuba, and many are also relevant to surface-supplied diving. Those skills which are critical to the safety of the diver may require more practice than is usually provided during training to achieve reliable long-term proficiency  Some of the skills are generally accepted by recreational diver certification agencies as necessary for any scuba diver to be considered competent to dive without direct supervision, and others are more advanced, though some diver certification and accreditation organizations may consider some of these to also be essential for minimum acceptable entry level competence.
Scuba set
A scuba set is any breathing apparatus that is carried entirely by an underwater diver and provides the diver with breathing gas at the ambient pressure. (Scuba is an anacronym for self-contained underwater breathing apparatus.) Although strictly speaking the scuba set is only the diving equipment which is required for providing breathing gas to the diver, general usage includes the harness by which it is carried, and those accessories which are integral parts of the harness and breathing apparatus assembly, such as a jacket or wing style buoyancy compensator and instruments mounted in a combined housing with the pressure gauge, and in the looser sense it has been used to refer to any diving equipment used by the scuba diver, though this would more commonly and accurately be termed scuba equipment.
Underwater diving
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. Immersion in water and exposure to high ambient pressure have physiological effects that limit the depths and duration possible in ambient pressure diving. Humans are not physiologically and anatomically well adapted to the environmental conditions of diving, and various equipment has been developed to extend the depth and duration of human dives, and allow different types of work to be done. In ambient pressure diving, the diver is directly exposed to the pressure of the surrounding water.
Surface-supplied diving
Surface-supplied diving is diving using equipment supplied with breathing gas using a diver's umbilical from the surface, either from the shore or from a diving support vessel, sometimes indirectly via a diving bell. This is different from scuba diving, where the diver's breathing equipment is completely self-contained and there is no link to the surface. The primary advantages of conventional surface supplied diving are lower risk of drowning and considerably larger breathing gas supply than scuba, allowing longer working periods and safer decompression. The copper helmeted free-flow standard diving dress is the version which made commercial diving a viable occupation, and although still used in some regions, this heavy equipment has been superseded by lighter free-flow helmets, and to a large extent, lightweight demand helmets, band masks and full-face diving masks.
Recreational diving
Recreational diving or sport diving is diving for the purpose of leisure and enjoyment, usually when using scuba equipment. The term "recreational diving" may also be used in contradistinction to "technical diving", a more demanding aspect of recreational diving which requires greater levels of training, experience and equipment to compensate for the more hazardous conditions associated with the disciplines. Breath-hold diving for recreation also fits into the broader scope of the term, but this article covers the commonly used meaning of "scuba diving for recreational purposes, where the diver is not constrained from making a direct near-vertical ascent to the surface at any point during the dive".
Diving cylinder
A diving cylinder, scuba tank or diving tank is a gas cylinder used to store and transport the high pressure breathing gas required by a scuba set. It may also be used for surface-supplied diving or as decompression gas or an emergency gas supply for surface supplied diving or scuba. Cylinders provide gas to the diver through the demand valve of a diving regulator or the breathing loop of a diving rebreather. Diving cylinders are usually manufactured from aluminium or steel alloys, and are normally fitted with one of two common types of cylinder valve for filling and connection to the regulator.
1_Apprentice
I love the ocean, I've never been scuba diving though.
0_Wizard
If I were to do it, I'd want to do is safely. You can get seriously messed up by surfacing too fast. The apparatus can expand the gases in your blood.
Scuba skills are the skills required to dive safely using self-contained underwater breathing apparatus, (scuba).
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Scuba skills
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Scuba diving
Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a regulator.
Decompression theory
Decompression theory is the study and modelling of the transfer of the inert gas component of breathing gases from the gas in the lungs to the tissues and back during exposure to variations in ambient pressure. In the case of underwater diving and compressed air work, this mostly involves ambient pressures greater than the local surface pressure, but astronauts, high altitude mountaineers, and travellers in aircraft which are not pressurised to sea level pressure, are generally exposed to ambient pressures less than standard sea level atmospheric pressure. In all cases, the symptoms caused by decompression occur during or within a relatively short period of hours, or occasionally days, after a significant pressure reduction.
Physiology of underwater diving
Physiology of underwater diving is the physiological influences of the underwater environment on the physiology of air-breathing animals, and the adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply. It, therefore, includes both the physiology of breath-hold diving in humans and other air-breathing animals, and the range of physiological effects generally limited to human ambient pressure divers either freediving or using underwater breathing apparatus. Several factors influence the diver, including immersion, exposure to the water, the limitations of breath-hold endurance, variations in ambient pressure, the effects of breathing gases at raised ambient pressure, effects caused by the use of breathing apparatus, and sensory impairment.
Underwater diving
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. Immersion in water and exposure to high ambient pressure have physiological effects that limit the depths and duration possible in ambient pressure diving. Humans are not physiologically and anatomically well adapted to the environmental conditions of diving, and various equipment has been developed to extend the depth and duration of human dives, and allow different types of work to be done. In ambient pressure diving, the diver is directly exposed to the pressure of the surrounding water.
History of underwater diving
The history of underwater diving starts with freediving as a widespread means of hunting and gathering, both for food and other valuable resources such as pearls and coral, By classical Greek and Roman times commercial applications such as sponge diving and marine salvage were established, Military diving also has a long history, going back at least as far as the Peloponnesian War, with recreational and sporting applications being a recent development. Technological development in ambient pressure diving started with stone weights (skandalopetra) for fast descent. In the 16th and 17th centuries diving bells became functionally useful when a renewable supply of air could be provided to the diver at depth, and progressed to surface supplied diving helmets - in effect miniature diving bells covering the diver's head and supplied with compressed air by manually operated pumps - which were improved by attaching a waterproof suit to the helmet and in the early 19th century became the standard diving dress.
Diving cylinder
A diving cylinder, scuba tank or diving tank is a gas cylinder used to store and transport the high pressure breathing gas required by a scuba set. It may also be used for surface-supplied diving or as decompression gas or an emergency gas supply for surface supplied diving or scuba. Cylinders provide gas to the diver through the demand valve of a diving regulator or the breathing loop of a diving rebreather. Diving cylinders are usually manufactured from aluminium or steel alloys, and are normally fitted with one of two common types of cylinder valve for filling and connection to the regulator.
Physiology of decompression
The physiology of decompression involves a complex interaction of gas solubility, partial pressures and concentration gradients, diffusion, bulk transport and bubble mechanics in living tissues. Gas is breathed at ambient pressure, and some of this gas dissolves into the blood and other fluids. Inert gas continues to be taken up until the gas dissolved in the tissues is in a state of equilibrium with the gas in the lungs, (see: "Saturation diving"), or the ambient pressure is reduced until the inert gases dissolved in the tissues are at a higher concentration than the equilibrium state, and start diffusing out again.
1_Apprentice
For sure, you can use the Wim Hoff breathing method to hold your breath even longer which means more time getting to see stuff too!
0_Wizard
I've heard of that. Yeah, it'd be terrible to experience symptoms of decompression for up to days.
In all cases, the symptoms caused by decompression occur during or within a relatively short period of hours, or occasionally days, after a significant pressure reduction.
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Decompression theory
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Decompression practice
The practice of decompression by divers comprises the planning and monitoring of the profile indicated by the algorithms or tables of the chosen decompression model, to allow asymptomatic and harmless release of excess inert gases dissolved in the tissues as a result of breathing at ambient pressures greater than surface atmospheric pressure, the equipment available and appropriate to the circumstances of the dive, and the procedures authorized for the equipment and profile to be used. There is a large range of options in all of these aspects. Decompression may be continuous or staged, where the ascent is interrupted by stops at regular depth intervals, but the entire ascent is part of the decompression, and ascent rate can be critical to harmless elimination of inert gas.
Decompression theory
Decompression theory is the study and modelling of the transfer of the inert gas component of breathing gases from the gas in the lungs to the tissues and back during exposure to variations in ambient pressure. In the case of underwater diving and compressed air work, this mostly involves ambient pressures greater than the local surface pressure, but astronauts, high altitude mountaineers, and travellers in aircraft which are not pressurised to sea level pressure, are generally exposed to ambient pressures less than standard sea level atmospheric pressure. In all cases, the symptoms caused by decompression occur during or within a relatively short period of hours, or occasionally days, after a significant pressure reduction.
Hyperbaric treatment schedules
Hyperbaric treatment schedules or hyperbaric treatment tables, are planned sequences of events in chronological order for hyperbaric pressure exposures specifying the pressure profile over time and the breathing gas to be used during specified periods, for medical treatment. Hyperbaric therapy is based on exposure to pressures greater than normal atmospheric pressure, and in many cases the use of breathing gases with oxygen content greater than that of air. A large number of hyperbaric treatment schedules are intended primarily for treatment of underwater divers and hyperbaric workers who present symptoms of decompression illness during or after a dive or hyperbaric shift, but hyperbaric oxygen therapy may also be used for other conditions.
Decompression sickness
Decompression sickness (DCS; also known as divers' disease, the bends or caisson disease) describes a condition arising from dissolved gases coming out of solution into bubbles inside the body on depressurisation. DCS most commonly refers to problems arising from underwater diving decompression (i.e., during ascent), but may be experienced in other depressurisation events such as emerging from a caisson, flying in an unpressurised aircraft at altitude, and extravehicular activity from spacecraft. DCS and arterial gas embolism are collectively referred to as decompression illness. Since bubbles can form in or migrate to any part of the body, DCS can produce many symptoms, and its effects may vary from joint pain and rashes to paralysis and death.
Decompression (diving)
The decompression of a diver is the reduction in ambient pressure experienced during ascent from depth. It is also the process of elimination of dissolved inert gases from the diver's body, which occurs during the ascent, during pauses in the ascent known as decompression stops, and after surfacing until the gas concentrations reach equilibrium. Divers breathing gas at ambient pressure need to ascend at a rate determined by their exposure to pressure and the breathing gas in use. A diver who only breathes gas at atmospheric pressure when free-diving or snorkelling will not usually need to decompress, Divers using an atmospheric diving suit do not need to decompress as they are never exposed to high ambient pressure.
History of decompression research and development
Decompression in the context of diving derives from the reduction in ambient pressure experienced by the diver during the ascent at the end of a dive or hyperbaric exposure and refers to both the reduction in pressure and the process of allowing dissolved inert gases to be eliminated from the tissues during this reduction in pressure. When a diver descends in the water column the ambient pressure rises. Breathing gas is supplied at the same pressure as the surrounding water, and some of this gas dissolves into the diver's blood and other tissues. Inert gas continues to be taken up until the gas dissolved in the diver is in a state of equilibrium with the breathing gas in the diver's lungs, (see: "Saturation diving"), or the diver moves up in the water column and reduces the ambient pressure of the breathing gas until the inert gases dissolved in the tissues are at a higher concentration than the equilibrium state, and start diffusing out again.
Physiology of decompression
The physiology of decompression involves a complex interaction of gas solubility, partial pressures and concentration gradients, diffusion, bulk transport and bubble mechanics in living tissues. Gas is breathed at ambient pressure, and some of this gas dissolves into the blood and other fluids. Inert gas continues to be taken up until the gas dissolved in the tissues is in a state of equilibrium with the gas in the lungs, (see: "Saturation diving"), or the ambient pressure is reduced until the inert gases dissolved in the tissues are at a higher concentration than the equilibrium state, and start diffusing out again.
1_Apprentice
Yeah I've heard of people getting the bends so bad it kills them.
0_Wizard
I saw something on television once about an incident when someone ascended too fast. They put them in a pressure chamber but it got released by accident...sucked his body through a small hole. 
Divers breathing gas at ambient pressure need to ascend at a rate determined by their exposure to pressure and the breathing gas in use.
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Decompression (diving)
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Diving regulator
A diving regulator is a pressure regulator that reduces pressurized breathing gas to ambient pressure and delivers it to the diver. The gas may be air or one of a variety of specially blended breathing gases. The gas may be supplied from a scuba cylinder carried by the diver or via a hose from a compressor or high pressure storage cylinders at the surface in surface-supplied diving. A gas pressure regulator has one or more valves in series which reduce pressure from the source, and use the downstream pressure as feedback to control the rate of flow and thereby the delivered pressure, lowering the pressure at each stage.
Water gun
A water gun (or water pistol, water blaster, or squirt gun) is a type of toy gun designed to shoot water. Similar to water balloons, the primary purpose of the toy is to soak another person in a game such as water warfare. Historically, water guns were made of metal and used rubber squeeze bulbs to load and propel water through a nozzle  Traditionally, water guns have worked on the same principle as a spray bottle. The body is essentially a container for water and the trigger is attached to a pump which squirts water out of a tiny hole at the muzzle or nozzle. However, many modern water guns employ more complex technologies to provide more power and water output than their predecessors.
Coffee percolator
A coffee percolator is a type of pot used for the brewing of coffee by continually cycling the boiling or nearly boiling brew through the grounds using gravity until the required strength is reached. Coffee percolators once enjoyed great popularity but were supplanted in the early 1970s by automatic drip coffee makers. Percolators often expose the grounds to higher temperatures than other brewing methods, and may recirculate already brewed coffee through the beans. As a result, coffee brewed with a percolator is particularly susceptible to over-extraction. Percolation may remove some of the volatile compounds in the beans, resulting in a pleasant aroma during brewing, but a less flavoursome cup.
List of Madagascar (franchise) characters
This is a list of characters that have appeared in the "Madagascar" films, the television series "The Penguins of Madagascar", and the Netflix series "All Hail King Julien". Tom McGrath explained in an interview that the intention of "Madagascar" was not to take a political stance on whether "zoos are bad and the wild is better, or that the wild is bad," but to show "the most extreme 'fish out of water' story that [they] could do". McGrath stated "the basic irony to the story is that, you think animals do belong in the wild, but if they're so accustomed to civility, they wouldn't know where food even came from," and the animals were meant to "love the zoo and to love where they are because they've got" "right off Fifth Avenue".
High–low system
The High-Low system, also referred to as the "High-Low Pressure system", the "High-Low Propulsion System", and the "High-Low projection system", is a design of cannon and antitank launcher using a smaller "high-pressure chamber" for storing the propellant. It enables a much larger projectile to be launched without the heavy equipment typically required for large caliber weapons. When the propellant is ignited, the higher pressure gases are bled out through vents (or ports) at reduced pressure to a much larger "low pressure chamber" to push the projectile forward. With the High-Low System a weapon can be designed with reduced or negligible recoil.
List of Friday the 13th characters
Friday the 13th is an American horror franchise that consists of twelve slasher films, a television show, novels, and comic books. The main villain in the series is Jason Voorhees, who drowned at Camp Crystal Lake as a boy due to the negligence of the teenage counselors. Decades later, the lake is rumored to be "cursed" and is the setting for a series of mass murders. Jason is featured in all of the films, either as the killer or as the motivation for the killings. Each entry in the series features a different cast of characters, including a final girl who defeats the killer in the end. Recurring characters in the series include Jason's vengeful mother Pamela Voorhees, Alice Hardy, Tommy Jarvis and Crazy Ralph.
List of Teenage Mutant Ninja Turtles characters
The following is a list of main characters in the "Teenage Mutant Ninja Turtles" franchise. The Teenage Mutant Ninja Turtles are a team of mutant red-eared sliders named after four Renaissance artists and living in the sewers of New York City, where they train by day and fight crime by night as ninjas. Leonardo is the calm and courageous leader of the Ninja Turtles. He is the most devoted student to Master Splinter and the study of Ninjutsu. Leo wears a blue mask and wields two ninjakens, also known as ninjatō. Raphael is the tough, sarcastic bad boy of the Ninja Turtles. Raph wears a red mask and wields a pair of sais.
1_Apprentice
Yeah it's like a vacuum, you can literally explode if the pressure is high enough. It's that law of gasses in action.
0_Wizard
Man... Imagine exploding from the inside. Must be terrible.
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Water gun
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Exploding cigar
An exploding cigar is a variety of cigar that explodes shortly after being lit. Such cigars are normally packed with a minute chemical explosive charge near the lighting end or with a non-chemical device that ruptures the cigar when exposed to heat. The customary intended purpose of exploding cigars is as a form of hostile practical joke, rather than to cause lasting physical harm to the butt of the joke. Nevertheless, the high risk of unintended injuries from their use caused a decline in their manufacture and sale. Although far rarer than their prank cousins, exploding cigars used as a means to kill or attempt to kill targets in real life has been claimed, and is well represented as a fictional plot device.
List of Batman: The Brave and the Bold characters
The following is a list of characters that appear in "". The characters are listed in alphabetical order. Most characters are seen in their classic appearance (Catwoman, Green Arrow), while others (Blue Beetle) have their current costume. Some have even been re-imagined for the show (the Outsiders). The characters are described below using in-universe tone. 'Mazing Man is a short man who dresses up as a superhero. In the "Kitty Catastrophe" segment of "Four Star Spectacular", he is the accident-prone catsitter for a couple named Owen and Fiona. It is apparent that Batman is his favorite superhero and the inspiration for his costume.
List of Heroes characters
This is a list of fictional characters in the television series "Heroes", the "Heroes" graphic novels, and the "Heroes" webisodes. Characters are listed by recent appearances ("Reborn") and title credit order (alphabetically). In its inaugural season, "Heroes" featured an ensemble cast of fourteen main characters. During the first season, the NBC "Heroes" cast page listed ten characters among the cast; Leonard Roberts arrived later, and Jack Coleman was promoted to series regular as of the eleventh episode. For the second season of the show, Santiago Cabrera, Tawny Cypress, and Leonard Roberts left the main cast.
List of Deadliest Warrior episodes
This is a list of episodes for "Deadliest Warrior". "Deadliest Warrior" premiered on April 7, 2009 at 10 pm ET. Nine one-hour episodes of the show were produced for Season 1. Season 1 was released on DVD and Blu-ray on May 11, 2010. Apache team: Alan Tafoya (World Champion Knife Fighter), Snake Blocker (U.S. Army Combat Instructor) Apache weapons: Tomahawk, Knife, Bow & Arrow, War Club Apache armor: Rawhide Shield  Apache statistics: "Height:" 5 feet, 7 inches "Weight:" 140 lbs "Gear Weight:" 10 pounds  Gladiator team: Chris Torres (Ancient Weapons Specialist), Steven Dietrich (Gladiator Combat Instructor), Chuck Liddell (The Iceman) Gladiator weapons: Cestus, Scissor, Trident & Net, Sling, Sica Gladiator armor: Murmillo Helmet, Wooden Shield  Gladiator statistics: "Height:" 5 feet, 8 inches "Weight": 185 lbs "Gear Weight": Ranges from 10 lbs to 38 lbs   Reenactment 1  The Apache is seen walking in a grassy field.
Nuclear weapon design
Nuclear weapon designs are physical, chemical, and engineering arrangements that cause the physics package of a nuclear weapon to detonate. There are three existing basic design types. In many existing designs, the explosive energy of deployed devices is derived primarily from nuclear fission, not fusion. (This includes fission of any U-238 tamper or casing due to fusion produced neutrons.) Pure fission weapons historically have been the first type to be built by a nation state. Large industrial states with well-developed nuclear arsenals have two-stage thermonuclear weapons, which are the most compact, scalable, and cost effective option once the necessary industrial infrastructure is built.
List of Marvel Family enemies (H–M)
Through his adventures, Fawcett Comics/DC Comics superhero Captain Marvel and his Marvel Family gained a host of enemies, including the following: An agent who tells Mr Tawny he can make a great singer out of him. Though his voice is terrible, people will want to see a singing tiger. When Billy tells him not to be forced into something he does not want, and when Hooey tries to stop him he transforms and tries to throw him out. But Hal flatters Tawny, making him sign the contract. When Cap criticises him, Hal claims he is jealous. A Gala party is arranged to celebrate this next day, but Hal drops the invitation to Captain Marvel into the bin as he wants their friendship to break up.
List of Wild Cards characters
This is a list of characters from the "Wild Cards" book series. The Astronomer is a character from the "Wild Cards" series of books. He first appeared in the short story "Pennies from Hell" by Lewis Shiner in "Wild Cards II: Aces High", though his presence was earlier implied in "The Long, Dark Night of Fortunato" in the first volume of the series. Leader of a cult consisting mainly of superhuman aces and deformed jokers known as the Egyptian Freemasons. The Astronomer planned to conquer the world in the aftermath of an invasion by fungoid aliens called the Swarm. Unknown to him, the Shakti device of the Egyptian Freemasons lacked a power source and was designed to contact an alien organization, the Network.