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Breathing gas mixed from helium and oxygen
Heliox is a breathing gas mixture of helium (He) and oxygen (O2). It is used as a medical treatment for patients with difficulty breathing because this
Heliox
Breathing gas consisting of oxygen, helium and nitrogen
mixture of helium and oxygen with a 0% nitrogen content is generally known as heliox. This is frequently used as a breathing gas in deep commercial diving operations
Trimix_(breathing_gas)
Heliox is a cryogenically cooled system produced by Oxford Instruments. Presently available in 2 varieties, the VL and TL, vertically loaded and top-loaded
Heliox_(cryogenic_equipment)
Medical device manufacturer
model specially calibrated specifically for 80:20 heliox gas for use in patients who may benefit from heliox therapy. In November 2015 Vapotherm announced
Vapotherm
Rigid head enclosure for underwater diving
difficulties and is very expensive when special breathing gases (such as heliox) are used. They also produce a constant noise inside the helmet, which can
Diving_helmet
Administration of gas in medical care
oxygen, medical gases include nitric oxide (NO), and helium-O2 mixtures (Heliox). Careful considerations and close monitoring needed when medical gases
Medical_gas_therapy
Breathing gas mixture of hydrogen, helium, and oxygen
usually below 130 metres (430 ft). Below this depth, extended breathing of heliox gas mixtures may cause high pressure nervous syndrome (HPNS). Two gas mixtures
Hydreliox
Underwater diving breathing gas supplied from the surface
band masks and full-face diving masks. Breathing gases used include air, heliox, nitrox and trimix. Saturation diving is a mode of surface supplied diving
Surface-supplied_diving
Underwater diving to a depth beyond the norm
diving field. For instance early experiments carried out by COMEX using heliox and trimix attained far greater depths than any recreational technical diving
Deep_diving
Diving mode and decompression technique
air diving to service the rigs. By 2017 about 80% of North Sea diving was heliox saturation diving and the other 20% shallow air diving. Excursion dives
Saturation_diving
Tabulated data to facilitate safe diving ascents
shallower than 21 msw per day. Several iterations of US Navy air, nitrox and heliox decpmpression tables have been published, for both constant gas fraction
Decompression_tables
Basis for the published decompression tables and algorithms
6 of the US Navy Diving Manual as the 2008 tables. Besides the air and heliox tables for open circuit bounce dives, the US Navy has published a variety
US Navy decompression models and tables
US_Navy_decompression_models_and_tables
Copper helmet with rubberised canvas diving suit and weighted boots
for heliox diving. These were successfully used during the rescue of the crew and salvage of the USS Squalus in 1939. The US Navy Mark V Mod 1 heliox mixed
Standard_diving_dress
2019 British documentary film
and eventually snapping the umbilical tether that provided Lemons with heliox breathing gas, as well as hot water to heat his suit, power for his light
Last_Breath_(2019_film)
Storage vessel for oxygen
cylinders gas blending, for mixing breathing gases such as nitrox, trimix and heliox open-circuit scuba sets - mainly used for accelerated decompression in technical
Oxygen_tank
Planned hyperbaric exposure using a specified breathing gas as medical treatment
air. Nitrox and Heliox mixtures are recommended by the US Navy for treatment gases at pressures exceeding 60 fsw (18 msw), and Heliox is preferred at
Hyperbaric treatment schedules
Hyperbaric_treatment_schedules
English broadcaster and natural historian (born 1926)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
David_Attenborough
Semi-submersible offshore drilling rig
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Byford_Dolphin
Gas used for human respiration
a 21:79 ratio of oxygen to nitrogen; the balance of the mix is helium. Heliox is a mixture of oxygen and helium and is often used in the deep phase of
Breathing_gas
Narcotic effects of respiratory nitrogen
oxygen toxicity become critical risk factors, gas mixtures such as trimix or heliox are used. These mixtures prevent or reduce narcosis by replacing some or
Nitrogen_narcosis
Electric vehicle charging connector for commercial vehicles
upgraded to 1 megawatt using MCS in fall 2023. The chargers will be built by Heliox. In May 2026, Germany's Federal Ministry of Transport (BMV) announced the
Megawatt_Charging_System
Inability to perform physical exercise at normal levels
and prolongs exercise tolerance. Heliox (79% helium, 21% oxygen) Heliox has a lower density than air. Breathing heliox lowers expiratory airflow resistance
Exercise_intolerance
Mixing and filling cylinders with breathing gases for use when scuba diving
diving cylinders with non-air breathing gases such as nitrox, trimix and heliox. Use of these gases is generally intended to improve overall safety of the
Gas_blending_for_scuba_diving
Respiratory infection often caused by a virus
evidence to support its use. There is tentative evidence that breathing heliox (a mixture of helium and oxygen) to decrease the work of breathing is useful
Croup
Process for automated charging of vehicles
manufacturers (Gillig, New Flyer, Nova Bus, Proterra), charger manufacturers (ABB, Heliox, Opbrid, Siemens, Toshiba), interface manufacturers (Furrer+Frey, Schunk
SAE_J3105
German multinational conglomerate
eBus, eTruck and passenger vehicle fast charging technology company, Heliox. In March 2024, Siemens announced the creation of a new £100m digital engineering
Siemens
Australian conservationist (1962–2006)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Steve_Irwin
Techniques requiring specific equipment and procedures
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 pure oxygen
Modes_of_underwater_diving
Technical diver training and certification agency
particularly diving with rebreathers and use of breathing gases such as trimix and heliox. TDI provides courses and certification for divers and for instructors.
Technical Diving International
Technical_Diving_International
French offshore diving contractor
deep saturation diving. In 1968, the Hydra I program started work with heliox (a breathing gas mixture of helium and oxygen) and hydreliox (an exotic
Compagnie maritime d'expertises
Compagnie_maritime_d'expertises
Safety concept in underwater diving
1.6 bar. The MOD is significant when planning dives using gases such as heliox, nitrox and trimix because the proportion of oxygen in the mix determines
Maximum_operating_depth
Submarine sinkhole north of Dahab, Egypt
Although the effects of nitrogen narcosis may be mitigated by using trimix or heliox the Arch is insufficiently deep to make these mixes obligatory and helium
Blue_Hole_(Red_Sea)
Canadian military diving rebreather
can be calibrated for the use of different diluents such as: air, trimix, heliox, or pure helium. Its first prototype set was made in March 1987. Diving
CUMA
Group of low-reactive, gaseous chemical elements
is used to replace part of the breathing mixtures, such as in trimix or heliox, a decrease in the narcotic effect of the gas at depth is obtained. Helium's
Noble_gas
High-pitched breathing sound due to obstruction of the larynx
of hours) may be needed for dexamethasone to work fully. Use of inhaled Heliox (70% helium, 30% oxygen); the effect is almost instantaneous. Helium, being
Stridor
Underwater diving using self contained breathing gas recycling apparatus
systems for surface-supplied diving. Gas reclaim systems used for deep heliox diving use similar technology to rebreathers, as do saturation diving life-support
Rebreather_diving
Topics referred to by the same term
diving cylinders with non-air breathing gases such as nitrox, trimix and heliox Tea blending, the process of blending different teas to produce a final
Blending
Chemical element with atomic number 2 (He)
breathing gas has no narcotic properties, so helium mixtures such as trimix, heliox and heliair are used for deep diving to reduce the effects of narcosis,
Helium
First ironclad of the US Navy, 1861–1862
their time on the bottom. The surface-supplied divers evaluated the use of heliox due to the depth of the wreck. It also proved to be successful once the
USS_Monitor
Italian special forces diving unit
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 suit. After World
Comando Raggruppamento Subacquei e Incursori Teseo Tesei
Comando_Raggruppamento_Subacquei_e_Incursori_Teseo_Tesei
Recreational technical scuba training and certification agency
courses specific to the use of both binary gas mixtures, such as Nitrox and Heliox, and ternary, such as Trimix. Since January 2006 recreational diving has
Trimix_Scuba_Association
Disorder from breathing helium based gas at high ambient pressure
should be maintained at a comfortable level. Including other gases in the heliox helium–oxygen mixture, such as nitrogen (creating trimix) or hydrogen (producing
High-pressure nervous syndrome
High-pressure_nervous_syndrome
US government scientific agency
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
National Oceanic and Atmospheric Administration
National_Oceanic_and_Atmospheric_Administration
Unplanned drop in the pressure of a sealed system
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Uncontrolled_decompression
Human body core temperature below 35 °C (95 °F)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Hypothermia
German filmmaker (1902–2003)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Leni_Riefenstahl
Method for comparing the narcotic effects of a mixed diving gas with air
estimating the narcotic effect of a breathing gas mixture, such as nitrox, heliox or trimix. The method is used, for a given breathing gas mix and dive depth
Equivalent_narcotic_depth
Injury due to pressure difference between gas filled space and adjoining tissue
effects on the vestibular organs. High-pressure nervous syndrome during heliox compression is also a central nervous system dysfunction. Inner ear injuries
Barotrauma
Anglo-Irish scientist (1627–1691)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Robert_Boyle
Disorder caused by dissolved gases forming bubbles in tissues
only gas that can cause DCS. Breathing gas mixtures such as trimix and heliox include helium, which can also cause decompression sickness. Helium both
Decompression_sickness
Breathing gas mixture experimentally used for very deep diving
Argox – Gas mixture occasionally used by scuba divers for dry-suit inflation Heliox – Breathing gas mixed from helium and oxygen Hydreliox – Breathing gas mixture
Hydrox_(breathing_gas)
American writer, botanist, and SCUBA and aviation enthusiast
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Fred_M._Roberts
Electrochemical device for measuring oxygen partial pressure
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 galvanic
Electro-galvanic oxygen sensor
Electro-galvanic_oxygen_sensor
Female divers of Jeju, South Korea
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Haenyeo
British Army Air Corps officer and astronaut (born 1972)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Tim_Peake
Field concerned with the safety, health and welfare of people at work
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Occupational safety and health
Occupational_safety_and_health
Facility for supporting saturation diving projects
and distribution to the consumers. Gases will include air, oxygen and heliox mixes The chamber control panel will typically include pressure gauges for
Saturation_diving_system
Death of bone tissue due to interruption of the blood supply
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Avascular_necrosis
American astronaut, circled the Moon in 2026 (born 1975)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Reid_Wiseman
Hyperbaric pressure vessel for human occupancy used in diving operations
must be rated for at least the planned operational depth. The US Navy has Heliox saturation decompression schedules for depths up to 480 msw (1600 fsw).
Diving_chamber
Professional diving on industrial projects
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Commercial_diving
Independent organisation of diving medical specialists from Northern Europe
water jets DMAC 04: Oxygen content in open circuit bail-out bottles for heliox saturation diving DMAC 05: Recommendation on minimum level of O2 in helium
Diving Medical Advisory Council
Diving_Medical_Advisory_Council
Equipment designed to help protect an individual from hazards
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Personal_protective_equipment
Mechanism that controls the pressure of a breathing gas supply for diving
technologically complex and expensive and is only used for deep commercial diving on heliox mixtures, where the saving on helium compensates for the expense and complications
Diving_regulator
Acoustic sensing method
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Sonar
Medical condition of lack of oxygen in the tissues
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Hypoxia_(medicine)
Elevated body temperature due to failed thermoregulation
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Hyperthermia
Manned wet submersible for deploying naval special forces
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
SEAL_Delivery_Vehicle
Underwater diving without breathing apparatus
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Freediving
Duplication of critical components to increase reliability of a system
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Redundancy_(engineering)
Scientific study of the ocean
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Oceanography
Austrian freediver and world record holder
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Herbert_Nitsch
Species of virus
reduced airway edema and mucus plugging to decrease airway obstruction. Heliox, a mixture of oxygen with helium, may reduce respiratory distress within
Respiratory_syncytial_virus
Respiration of oxygen-rich liquid by a normally air-breathing organism
mixes such as trimix or heliox reduce the risk of nitrogen narcosis but, in the case of trimix, do not eliminate it. Heliox eliminates the risk of nitrogen
Liquid_breathing
Aide-memoire to ensure consistency and completeness in carrying out a task
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Checklist
British military electronically controlled closed circuit rebreather
metres (200 ft) using air as diluent, or up to 120 metres (390 ft) using heliox and trimix. Some sources describe it as a "Stealth Clearance Divers Life
Clearance Divers Life Support Equipment
Clearance_Divers_Life_Support_Equipment
Special forces unit of the British Army
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Special_Air_Service
accelerate elimination of inert gas 1965 – US Navy published Nitrox and Heliox tables developed by Robert D. Workman. 1965 – The first commercial saturation
History of decompression research and development
History_of_decompression_research_and_development
Crewed deep-ocean research submersible
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
DSV_Alvin
Swiss physicist, inventor, and explorer
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Auguste_Piccard
Scientific study of ocean life
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Marine_biology
Surface waves generated by wind on open water
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Wind_wave
Physiological responses to immersion of air-breathing vertebrates
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Diving_reflex
Procedures for safe ascent and descent in underwater diving
dioxide buildup caused by inadequate exhalation, and for divers breathing heliox at great depths, by high-pressure nervous syndrome. Ascents of divers breathing
Ascending and descending (diving)
Ascending_and_descending_(diving)
Special operations unit of the Israeli Navy
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Shayetet_13
Technique for equalising pressure in the middle ears
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Valsalva_maneuver
Indian Navy special operations force
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
MARCOS
Irish safety freediver (1977-2017)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Stephen_Keenan
South African diver (1974–1994)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Deon_Dreyer
Techniques and procedures for safe decompression of divers
blends can also be used after a trimix dive, and oxygen rich heliox blends after a heliox dive, and these may reduce risk of isobaric counterdiffusion
Decompression_practice
Chamber for transporting divers vertically through the water
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Diving_bell
Perception of one's environment
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Situation_awareness
British cave diver who specialises in rescues
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Rick_Stanton
Submersible that traveled to the Challenger Deep
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Deepsea_Challenger
Safe isolation of dangerous equipment during maintenance or testing
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Lockout–tagout
English medical researcher (1931–2022)
resulting from breathing a high-pressure mixture of helium and oxygen known as heliox at depths greater than about 150 metres (490 ft). Bennett was a consultant
Peter_B._Bennett
U.S. Navy officer and NASA astronaut (born 1965)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Sunita_Williams
Container to supply high pressure gas for diving operations
available. High-pressure storage is commonly used when blending nitrox, heliox and trimix diving gases, and for oxygen for rebreathers and decompression
Diving_cylinder
French oceanographer and author (1910–1997)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Jacques_Cousteau
Evidence of physiological disorders resulting from underwater diving
depths beyond about 150 metres (500 ft), because a helium–oxygen mixture (heliox) then causes high pressure nervous syndrome. More exotic mixtures such as
List of signs and symptoms of diving disorders
List_of_signs_and_symptoms_of_diving_disorders
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