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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
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
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)
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
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)
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
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
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
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
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
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
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
French offshore diving contractor
experimented with the use of hydrogen in the divers' breathing gas. This work with heliox (a breathing gas mixture of helium and oxygen) and hydreliox (an exotic
Compagnie maritime d'expertises
Compagnie_maritime_d'expertises
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
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
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
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
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
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
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
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
Equipment used in the support of an underwater diving operation
cylinders Gas storage tube – Large volume, high pressure gas storage cylinder Heliox – Breathing gas mixed from helium and oxygen Helium analyzer – Instrument
Diving_support_equipment
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
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
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
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
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
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
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
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)
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
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
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
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
Ship used as a floating base for professional diving projects
system – For diving operations below 50 m, a mixture of helium and oxygen (heliox) is required to eliminate the narcotic effect of nitrogen under pressure
Diving_support_vessel
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
Inflammation of the small airways in the lungs
not support include salbutamol, steroids, antibiotics, antivirals, and heliox. Maintaining hydration is an important part of management of bronchiolitis
Bronchiolitis
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
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
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
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
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
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
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)
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
Substance which decreases the viscosity or concentration of fluids
gases are nitrogen, provided in the form of air, and helium, provided as heliox, or both nitrogen and helium together as trimix. The diluent used in scuba
Diluent
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
British ocean liner (1907–1915)
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
RMS_Lusitania
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
Opening in the base of a hull, platform, or chamber giving access to the water below
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Moon_pool
Use of high-pressure water jet for cleaning hard surfaces
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Pressure_washing
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
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
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
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
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
Mathematical model of tissue inert gas uptake and release with pressure change
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Bühlmann decompression algorithm
Bühlmann_decompression_algorithm
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 (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
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
US Marine Corps special forces unit
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Marine_Raider_Regiment
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
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
Nausea caused by motion or perceived motion
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Motion_sickness
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
Human habitable underwater enclosure filled with breathable gas
of 30 metres (100 ft) for a week. They were among the first to breathe heliox, a mixture of helium and oxygen, avoiding the normal nitrogen/oxygen mixture
Underwater_habitat
Finnish manufacturer of compasses, dive computers and sports watches
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Suunto
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)
Breathing gas, mixture of nitrogen and oxygen
narcosis symptoms are more likely to occur. For deep diving, trimix or heliox gases are typically used; these gases contain helium to reduce the amount
Nitrox
Diving beyond the scope of recreational diving
helium to replace some of the nitrogen in the diver's breathing mixture, or heliox, in which there is no nitrogen. Technical dives may alternatively be defined
Technical_diving
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
Systems to provide gases for medical use in healthcare facilities
4 bar (400 kPa; 58 psi). Two common medical gas mixtures are entonox and heliox. Station outlet NFPA 99: Health Care Facilities Code (2015) CSA Z7396.1-17
Medical_gas_supply
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
Tethered underwater mobile device operated by a remote crew
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Remotely operated underwater vehicle
Remotely_operated_underwater_vehicle
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
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
Severely deficient supply of oxygen
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Asphyxia
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
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
Descending below the surface of the water to interact with the environment
chamber atmosphere composition or pressure. Because sound travels faster in heliox than in air, voice formants are raised, making divers' speech high-pitched
Underwater_diving
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
U.S. Navy's 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
United_States_Navy_SEALs
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
Filling pressurized gas from a series of storage cylinders
expensive oxygen, for nitrox, and the even more expensive helium in trimix or heliox mixtures. Cascade storage is used at compressed natural gas (CNG) fueling
Cascade_filling_system
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
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
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
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
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
American manufacturer of commercial diving equipment
hyperbaric medicine. In 1935, Nohl, Craig and Browne designed a lightweight heliox diving suit to dive to the liner Lusitania, sunk in May 1915 by a German
DESCO
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
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
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
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
Cylindrical container for storing pressurised gas
dangerous goods. Diving gases, including compressed air, oxygen, nitrox, heliox, trimix, helium and argon, are non-toxic, non flammable, and may be oxidizer
Gas_cylinder
Closed or semi-closed circuit scuba
for scuba or surface-supplied diving. Gas reclaim systems used for deep heliox diving use similar technology to rebreathers, as do saturation diving life
Diving_rebreather
Consolidating a motor task into memory through repetition
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment
Muscle_memory
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
HELIOX
HELIOX
HELIOX
HELIOX
Girl/Female
Arabic, Muslim
Adornment
Boy/Male
American, Australian, British, English, Greek, Latin
Productive; Fertile; Resurrection
Girl/Female
Arabic
Lily
Female
English
Variant spelling of English Imogen, IMOGENE means "girl, maiden."Â
Female
Native American
Native American Hopi name HONOVI means "strong deer."
Female
English
Pet form of English Theodora, THEDA means "gift of God."
Girl/Female
Hindu, Indian, Traditional
Lotus
Girl/Female
Indian
God Laxmi
Girl/Female
Indian
Fulfilling desire, Belonging to the north east
Girl/Female
Tamil
River Sharayu
HELIOX
HELIOX
HELIOX
HELIOX
HELIOX