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Breathing gas, mixture of nitrogen and oxygen
Nitrox refers to any gas mixture composed (excepting trace gases) of nitrogen and oxygen. It is usually used for mixtures that contain less than 78% nitrogen
Nitrox
Diving beyond the scope of recreational diving
experience. The equipment involves breathing gases other than air or standard nitrox mixtures, and multiple gas sources. Most technical diving is done within
Technical_diving
Swimming underwater, breathing gas carried by the diver
scientific use of nitrox in the NOAA Diving Manual. In 1985 IAND (International Association of Nitrox Divers) began teaching nitrox use for recreational
Scuba_diving
Mixing and filling cylinders with breathing gases for use when scuba diving
is the filling of diving cylinders with non-air breathing gases such as nitrox, trimix and heliox. Use of these gases is generally intended to improve
Gas_blending_for_scuba_diving
Method of comparing decompression requirements for air and a given nitrox mix
different proportions to those in air, known as nitrox. The equivalent air depth, for a given nitrox mix and depth, is the depth of a dive when breathing
Equivalent_air_depth
Russian military rebreather for underwater and high altitude use
hinged cover. It has a small optional nitrox cylinder which can be clipped on its outside to convert it to nitrox mode. It contains one oxygen cylinder
IDA71
Recreational and technical scuba training and certification agency
The International Association of Nitrox and Technical Divers (IANTD) is a scuba diving organization concerned with certification and training in recreational
International Association of Nitrox and Technical Divers
International_Association_of_Nitrox_and_Technical_Divers
Breathing gas consisting of oxygen, helium and nitrogen
loop can be hyperoxic (meaning more oxygen than in air, as in enriched air nitrox) in shallow water, because the rebreather automatically adds oxygen to maintain
Trimix_(breathing_gas)
International organisation for underwater activities
Divers Nitrox Instructor Advanced Nitrox Instructor Nitrox Instructor Three Star Ice Diver Instructor Trimix Instructor Advanced Trimix Instructor Nitrox Gas
Confédération Mondiale des Activités Subaquatiques
Confédération_Mondiale_des_Activités_Subaquatiques
Recreational diver training and certification agency
American Nitrox Divers International (or ANDI) was founded by Ed Betts and Dick Rutkowski in 1988. ANDI has since expanded to include offices in The United
American Nitrox Divers International
American_Nitrox_Divers_International
2018 international rescue mission in Thailand
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Tham_Luang_cave_rescue
Origins and development of diving using breathing gas carried by the diver
scientific use of nitrox in the NOAA Diving Manual. In 1985 IAND (International Association of Nitrox Divers) began teaching nitrox use for recreational
History_of_scuba_diving
Techniques requiring specific equipment and procedures
wear diving helmets or full-face diving masks. The bottom gas can be air, nitrox, heliox or trimix; the decompression gases may be similar, or may include
Modes_of_underwater_diving
Physiologist, aquanaut and researcher (1940–2017)
deep diving, and the use of nitrox as a breathing gas for diving. He is known for developing the widely used NOAA Nitrox I (32% O2/N2) and II (36% O2/N2)
John_Morgan_Wells
Toxic effects of breathing oxygen at high partial pressures
Recreational scuba divers commonly breathe nitrox containing up to 40% oxygen, while technical divers use pure oxygen or nitrox containing up to 80% oxygen to accelerate
Oxygen_toxicity
American pioneer in hyperbaric and diving medicine
training and safety including American Nitrox Divers International (ANDI), the International Association of Nitrox Divers (IAND) - which later became known
Dick_Rutkowski
Safety concept in underwater diving
underwater diving activities such as saturation diving, technical diving and nitrox diving, the maximum operating depth (MOD) of a breathing gas is the depth
Maximum_operating_depth
Container to supply high pressure gas for diving operations
contains nitrox or a helium based gas. closed circuit rebreathers have an oxygen cylinder and a "diluent" cylinder, which contains air, nitrox or a helium
Diving_cylinder
German manufacturer of breathing equipment
for oxygen use at depths of up to 20 metres, and the DM40, designed for nitrox use at depths of up to 40 metres. The DM40 system used both an oxygen cylinder
Dräger_(company)
Agencies which issue certification for competence in diving skills
Association des Moniteurs de la CMAS du Quebec CMAS code CAN/F05 ANDI - American Nitrox Divers International – Recreational diver training and certification agency
List of diver certification organizations
List_of_diver_certification_organizations
Type of diving rebreather used by the Royal Navy
for nitrox mode (which the Navy called "mixture"), and then the set was sometimes called CDMBA.[clarification needed] The Royal Navy was using nitrox from
Siebe_Gorman_CDBA
Gas mixture occasionally used by scuba divers for dry-suit inflation
The mixture is made with the same gas blending techniques used to make nitrox, except that for argox, the argon is added to the initial pure oxygen partial-fill
Argox
Tabulated data to facilitate safe diving ascents
on the RGBM model in 2001. NOAA Nitrox I, also known as EAN32, a nitrox blend with 32% oxygen by volume, and NOAA Nitrox II, or EAN36, with 36% oxygen are
Decompression_tables
Material
to as nitrox. FKMs are used because they have a lower probability of catching fire, even with the increased percentages of oxygen found in nitrox. They
FKM
Sports bike by Bajaj Auto
triple spark-ignition & liquid-cooled engine. It uses exhaust, and rear nitrox-charged mono-shock suspension. In 2024 Bajaj Updated the Pulsar NS Series
Bajaj_Pulsar_NS200
Nitrox semi-closed-circuit rebreather with liquid gas storage
playing wind instruments) and from aerophone. The Blackett's Aerophor is a nitrox semi-closed-circuit rebreather with liquid gas storage made in England from
Blackett's_Aerophor
Military semi-closed circuit passive addition diving rebreather
The Interspiro DCSC is a semi-closed circuit nitrox rebreather manufactured by Interspiro of Sweden for military applications. Interspiro was formerly
Interspiro_DCSC
Underwater diving breathing gas supplied from the surface
masks and full-face diving masks. Breathing gases used include air, heliox, nitrox and trimix. Saturation diving is a mode of surface supplied diving in which
Surface-supplied_diving
Special forces unit of the British Army
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Special_Air_Service
Scuba set with variable-density buoyancy control
capacity of about 106 cubic feet of atmospheric pressure air or recreational nitrox. The fully charged set is slightly buoyant and lighter than the equivalent
Avelo_diving_system
Gas used for human respiration
the dive. Diving using mixed gases is referred to as mixed gas diving. Nitrox is a mixture of oxygen and nitrogen, either by mixing oxygen with air, or
Breathing_gas
Recreational technical scuba training and certification agency
specializing in training and certification in technical diving and the safe use of nitrox and trimix. TSA was founded in Switzerland and has been active in Italy
Trimix_Scuba_Association
Techniques and procedures for safe decompression of divers
accelerated decompression for a relatively low risk of bubble formation. Nitrox mixtures and oxygen are the most commonly used gases for this purpose, but
Decompression_practice
Pioneering technical and cave diver (1939–2022)
formed known as the International Association of Nitrox Divers or IAND, which was dedicated to teaching Nitrox to recreational divers. In 1992 Mount was named
Tom_Mount
Estimation of breathing gas mixtures and quantities required for a planned dive profile
nitrogen and oxygen is known as nitrox. The traces of argon and other atmospheric gases are considered to be unimportant. Nitrox is a mixture of nitrogen and
Scuba_gas_planning
Storage vessel for oxygen
high pressure cylinders gas blending, for mixing breathing gases such as nitrox, trimix and heliox open-circuit scuba sets - mainly used for accelerated
Oxygen_tank
Pressure reduction and its effects during ascent from depth
D. Thalmann published the USN E-L algorithm and tables for constant PO2 Nitrox closed circuit rebreather applications, and extended use of the E-L model
Decompression_(diving)
Equipment used by divers to facilitate decompression
("accelerated") by breathing an oxygen-rich "decompression gas" such as a nitrox blend or pure oxygen. The high partial pressure of oxygen in such decompression
Decompression_equipment
Australian conservationist (1962–2006)
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Steve_Irwin
Mechanism that controls the pressure of a breathing gas supply for diving
in cold water. Standard air regulators are considered to be suitable for nitrox mixtures containing 40% or less oxygen by volume, both by NOAA, which conducted
Diving_regulator
Diver certification agency
without harming it) Nitrox 2 – Advanced Nitrox Gas Blender 1 – (ISO 13293) covers Nitrox, Gas Blender 2 – (ISO 13293) covers Nitrox and Trimix, Intro Trimix
Professional Technical and Recreational Diving
Professional_Technical_and_Recreational_Diving
Recreational scuba and freediving training and certification agency
suit diving techniques and suit maintenance EAN Nitrox - planning dives with Nitrox and using Nitrox safely, including analyzing the mix before use. Decompression
Scuba_Schools_International
Pioneering technical diver and author (1951–2023)
VAST Inc. contract took him to the Caribbean where he worked to develop nitrox and decompression procedures for their dive teams. It was here that Gilliam's
Bret_Gilliam
List of articles related to underwater diving grouped by topical relevance
operating in the very high frequency maritime mobile band Nitrox production – Methods of producing nitrox mixtures Membrane gas separation – Technology for splitting
Outline_of_underwater_diving
Diving for the purpose of leisure and enjoyment
single nitrox mixture with an oxygen fraction not exceeding 40% for the planned dive, but this does not preclude constant oxygen partial pressure nitrox provided
Recreational_diving
Exposure of tissues to abnormally high concentrations of oxygen
known as nitrox is used to reduce the risk of decompression sickness by substituting oxygen for part of the nitrogen content. Breathing nitrox can lead
Hyperoxia
Powered device for diver mobility and range extension
Encyclopedia (1st ed.). Miami Shores, Florida: International Association of Nitrox Divers. pp. 51–60. ISBN 978-0-915539-10-9. Rossier, Robert N. "Redefining
Diver_propulsion_vehicle
Building structures in or adjacent to large bodies of water
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Marine_construction
Distinct layer of temperature change in a body of water
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Thermocline
Technical diver training and certification agency
and David Sipperly after a split away from International Association of Nitrox and Technical Divers (IANTD) in 1993. The agency aimed to provide training
Technical Diving International
Technical_Diving_International
Italian Goa trance band
could realize some of the best goa trance tracks ever. Their fourth album, Nitrox (2001) is the result of this evolution and worked really well on the dance-floors
Etnica
Special forces unit of the Royal Navy
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Special_Boat_Service
Crewed full ocean depth rated submersible
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
DSV_Limiting_Factor
Swimming while inhaling through a snorkel
Biologie Marine. 59: 451–460. doi:10.21411/CBM.A.B05FC714. "Dive-Tech: TDI Nitrox, Helitrox, Trimix and technical diver training courses with instructor Mark
Snorkeling
NASA operations facility in Texas
Conkin J (2003). "Improved pulmonary function in working divers breathing nitrox at shallow depths". Undersea Hyperb Med Abstract. 30 (Supplement): 763–7
Johnson_Space_Center
Cloudiness of a fluid
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Turbidity
Hazards associated with underwater diving
of diving days, number of dives in a repetitive series, last dive depth, nitrox use, and drysuit use. No significant associations with decompression sickness
List of diving hazards and precautions
List_of_diving_hazards_and_precautions
Use of diving techniques in the pursuit of scientific knowledge
operated underwater vehicles. Breathing gases used include air, oxygen, nitrox, trimix, heliox and experimental mixtures. The study of diving physiology
Scientific_diving
English broadcaster and natural historian (born 1926)
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
David_Attenborough
Injury due to pressure difference between gas filled space and adjoining tissue
lung barotrauma are hyperbaric and normobaric oxygen, hyperbaric heliox or nitrox, isotonic fluids, anti-inflammatory medications, decongestants, and analgesics
Barotrauma
Change in sea level due to gravity
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Tide
American physician and novelist (born 1940)
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Robin Cook (American novelist)
Robin_Cook_(American_novelist)
Diving mode and decompression technique
work of breathing, but at shallow depths saturation diving can be done on nitrox mixtures. Most of the physiological and medical aspects of diving to the
Saturation_diving
Portable apparatus to recycle breathing gas
variants of some of their diving oxygen rebreathers (= what is now called "nitrox"): SCMBA from the SCBA (Swimmer Canoeist's Breathing Apparatus), and CDMBA
Rebreather
Topics referred to by the same term
curriculum Enrichment of breathing gas for scuba diving (e.g. in Enriched Air Nitrox) Cultural enrichment (disambiguation) GO Term Enrichment, in biology Enrich
Enrichment
Diving incident in the Maldives
divemaster and deep diver, as well as a Technical Diving International certified nitrox diver. Federico Gualtieri was a diving instructor and had a master's degree
2026 Dhekunu Kandu cave diving incident
2026_Dhekunu_Kandu_cave_diving_incident
Abnormally high tissue carbon dioxide levels
Encyclopedia (1st ed.). Miami Shores, Florida: International Association of Nitrox Divers. pp. 279–286. ISBN 978-0-915539-10-9. Stapczynski J. S, "Chapter
Hypercapnia
Training process for people who do not dive at work
first aid on land General First aid Technical diving techniques: Using Nitrox as a bottom gas Analyzing proportion of oxygen in a breathing gas Calculating
Recreational_diver_training
Underwater diving using self contained breathing gas recycling apparatus
(NOAA). All three organisations require full scientific diver status with nitrox certification as prerequisite, NOAA requires certification to 130 feet (40 m)
Rebreather_diving
American biomedical researcher (born 1967)
Encyclopedia (The Tao of Survival Underwater). The International Association of Nitrox and Technical Divers (IANTD). ISBN 9780915539109 Dituri, J.A., and Joseph
Joseph_Dituri
Canadian astronaut, circled the Moon in 2026 (born 1976)
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Jeremy_Hansen
Type of motorcycle
model was launched in 2007, which features a front disc brake, self-start, nitrox suspension, and black alloy wheels. The silver engine has also been powder-coated
Bajaj_Discover
Ships sunk by 1902 eruption in Martinique
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Wrecks_of_Saint-Pierre_harbor
UK governing body of recreational diving
to Ellesmere Port, North West England. 1995: BSAC allows Nitrox diving and introduced Nitrox training. 1997, 20 May: BSAC was expelled from the Confédération
British_Sub-Aqua_Club
Tactical scuba diver
because of the risk of seizure due to acute oxygen toxicity. The use of nitrox or mixed gas rebreathers can extend this depth range considerably, but this
Frogman
2006 animal encounter accident
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Death_of_Steve_Irwin
Semi-submersible offshore drilling rig
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Byford_Dolphin
Australian anesthesiologist and cave diver
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Richard_Harris_(anaesthetist)
Descending below the surface of the water to interact with the environment
wear diving helmets or full-face diving masks. The bottom gas can be air, nitrox, heliox or trimix; the decompression gases may be similar, or may include
Underwater_diving
American engineer, vintner, and former NASA astronaut
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
José_M._Hernández
Polish special forces unit
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
GROM_Military_Unit
Electrochemical device for measuring oxygen partial pressure
surface supplied mixed gas diving to analyse the proportion of oxygen in a nitrox, heliox or trimix breathing gas before a dive. These cells are lead/oxygen
Electro-galvanic oxygen sensor
Electro-galvanic_oxygen_sensor
Scuba component used to functionally connect diving cylinders
required to scuba-dive safely Beresford, Michael (2006). CMAS-ISA Advanced Nitrox Diver Manual (3rd ed.). CMAS-ISA. Mount, Tom (August 2008). "9: Equipment
Scuba_manifold
Breathing gas mixed from helium and oxygen
Argox – Gas mixture occasionally used by scuba divers for dry-suit inflation Nitrox – Breathing gas, mixture of nitrogen and oxygen Hydreliox – Breathing gas
Heliox
Estimation of risk associated with exposure to a given set of hazards
Encyclopedia (1st ed.). Miami Shores, Florida: International Association of Nitrox Divers. pp. 165–180. ISBN 978-0-915539-10-9. "2018 Accreditation Rubric"
Risk_assessment
Mathematical model of tissue inert gas uptake and release with pressure change
(1986) ZH-L 16 or ZH-L 16 A (air, nitrox): The experimental set of parameters published in 1986. ZH-L 16 B (air, nitrox): The set of parameters modified
Bühlmann decompression algorithm
Bühlmann_decompression_algorithm
Closed or semi-closed circuit scuba
variants of some of their diving oxygen rebreathers (= what is now called "nitrox"): SCMBA from the SCBA (Swimmer Canoeist's Breathing Apparatus), and CDMBA
Diving_rebreather
Topics referred to by the same term
blending, the filling of diving cylinders with non-air breathing gases such as nitrox, trimix and heliox Tea blending, the process of blending different teas
Blending
US Navy special operations group
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Underwater_Demolition_Team
Physiological response to sudden exposure to cold
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Cold_shock_response
Free-diving self-propelled deep-sea submersible
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Bathyscaphe
Umbrella organisation representing scuba diver training organisations in Europe
CB 2005004) American Nitrox Divers International (EUF CB 2005005) DSF (EUF CB 2005006) IANTD International Association of Nitrox and Technical Divers
European Underwater Federation
European_Underwater_Federation
Italian special forces diving unit
Subacquei - GOS) specialises in scuba diving with air to 60 m, oxygen to 12 m, nitrox to 54 m, heliox to 150 m, and to 300 m with a mini-submarine or a special
Comando Raggruppamento Subacquei e Incursori Teseo Tesei
Comando_Raggruppamento_Subacquei_e_Incursori_Teseo_Tesei
Respiratory impairment caused by submersion in liquid
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Drowning
French diver training and certification agency
40 m with Trimix and is a diving officer for dives from 0–40 m with air/nitrox and 70 m with Trimix. The level E4 Moniteur fédéral 2e degré (MF2) or Moniteur
Fédération Française d'Études et de Sports Sous-Marins
Fédération_Française_d'Études_et_de_Sports_Sous-Marins
Pioneering American deep-sea diver
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Amelia_Behrens-Furniss
Gaseous diffusion through body tissue at constant total pressure
nitrogen-rich mix, as is common in technical diving when switching from trimix to nitrox on ascent, may cause a transient supersaturation of inert gas within the
Isobaric_counterdiffusion
American novelist and underwater explorer (1931–2020)
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Clive_Cussler
Practice in pipeline transportation
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Pigging
Underwater diving to a depth beyond the norm
Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo diving system
Deep_diving
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