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Emergency supply of breathing gas for an underwater diver
underwater diving, an alternative air source, or more generally alternative breathing gas source, is a secondary supply of air or other breathing gas
Alternative_air_source
Most common type of heat pump
An air source heat pump (ASHP), the most common type of heat pump, can absorb energy (heat) sourced from cold ambient air outside a building, and release
Air_source_heat_pump
Special forces unit of the British Army
The Special Air Service (SAS) is a special forces unit of the British Army. It was founded as a regiment in 1941 by David Stirling, and in 1950 it was
Special_Air_Service
Fuels from sources other than fossil fuels
Alternative fuels, also known as non-conventional and advanced fuels, are fuels derived from sources other than petroleum. Alternative fuels include gaseous
Alternative_fuel
Vehicle not powered by petrol or diesel
including climate change and air pollution, high oil-prices and the potential for peak oil, development of cleaner alternative fuels and advanced power systems
Alternative_fuel_vehicle
U.S. Navy's special operations force
The United States Navy Sea, Air, and Land (SEAL) Teams, commonly known as Navy SEALs, are the United States Navy's primary special operations force and
United_States_Navy_SEALs
Energy collected from renewable resources
change. In general, renewable energy sources pollute much less than fossil fuels. Renewables also cause much less air pollution than fossil fuels, improving
Renewable_energy
Air pollution emitted by motor vehicles, airplanes, locomotives, and other engines
Mobile source air pollution includes any air pollution emitted by motor vehicles, airplanes, locomotives, and other engines and equipment that can be
Mobile_source_air_pollution
Vascular blockage by air bubbles
An air embolism, also known as a gas embolism, is a blood vessel blockage caused by one or more bubbles of air or other gas in the circulatory system
Air_embolism
This is a list of alternative media supporting the views of the American political left. It covers alternative media sources including talk radio programs
Left-wing alternative media in the United States
Left-wing_alternative_media_in_the_United_States
Underwater diving to a depth beyond the norm
and limiting the rate of compression. If hydrogen is considered as an alternative, a possible explosion risk is balanced against less narcosis than nitrogen
Deep_diving
Small independent scuba cylinder usually carried for emergency gas supply
emergency, such as depletion of the diver's main air supply, it can be used as an alternative air source or bailout bottle to allow a normal ascent in place
Pony_bottle
Special forces unit of the Australian Army
The Special Air Service Regiment, officially abbreviated SASR and commonly known as SAS, is a special forces unit of the Australian Army. Formed in 1957
Special_Air_Service_Regiment
Training to update existing skills and knowledge
clearing, neutral buoyancy, ditching weights and ascent using an alternative air source. PADI suggest a refresher after six months inactivity, but the actual
Refresher_training
Energy that responsibly meets social, economic, and environmental needs
range from greenhouse gas emissions and air pollution to energy poverty and toxic waste. Renewable energy sources such as wind, hydro, solar, and geothermal
Sustainable_energy
Unplanned drop in the pressure of a sealed system
Explosive decompression (ED) is violent and too fast for air to escape safely from the lungs and other air-filled cavities in the body such as the sinuses and
Uncontrolled_decompression
Technology of indoor and vehicular environmental comfort
engineers may integrate HVAC systems with other building systems (i.e. Air-source heat pump water heater) and use energy modeling to evaluate performance
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Clean air agency in California, United States
target date of 2020. Alternative Fuel Vehicle Incentive Program (also known as Fueling Alternatives) is funded by the California Air Resources Board (CARB)
California Air Resources Board
California_Air_Resources_Board
US government scientific agency
trends, dispersion of air pollutant plumes, air quality, atmospheric deposition, and related variables.[self-published source] The Atlantic Oceanographic
National Oceanic and Atmospheric Administration
National_Oceanic_and_Atmospheric_Administration
Cooling of air in an enclosed space
for the use of alternatives, such as passive cooling, evaporative cooling, selective shading, windcatchers, and thermal insulation. Air conditioning dates
Air_conditioning
Disorder caused by dissolved gases forming bubbles in tissues
vary from joint pain and rashes to paralysis and death. DCS often causes air bubbles to settle in major joints like knees or elbows, causing individuals
Decompression_sickness
Swimming underwater, breathing gas carried by the diver
gas from each other in an emergency, and may carry an independent alternative air source if they do not choose to rely on a buddy. Divers may need to make
Scuba_diving
Medical treatment at raised ambient pressure
pressurized vessels containing prescribed barometric pressures of gases such as air or oxygen. The immediate effects include reducing the size of gas emboli
Hyperbaric_medicine
Descending below the surface of the water to interact with the environment
briefing, safety drills, thermal protection, equipment redundancy, alternative air source, buddy checks, buddy or team diving procedures, dive planning, use
Underwater_diving
Underwater diving breathing gas supplied from the surface
enough to allow a fairly high flow rate, as the air may be used as an alternative breathing air source, or to fill small lift bags. A pneumofathometer
Surface-supplied_diving
Acoustic sensing method
location in air was used before the introduction of radar. Sonar may also be used for robot navigation, and sodar (an upward-looking in-air sonar) is used
Sonar
Toxic effects of breathing oxygen at high partial pressures
Hyperventilation of atmospheric air at atmospheric pressures does not cause oxygen toxicity, because sea-level air has a partial pressure of oxygen of
Oxygen_toxicity
Skills required to scuba-dive safely
both divers knowing in advance the configuration of the donor's alternative air source, its routing, and the agreed method of donation, which is why familiarisation
Scuba_skills
Narcotic effects of respiratory nitrogen
in most cases, as it is also the appropriate response for most of the alternative causes for the symptoms. The management of inert gas narcosis is usually
Nitrogen_narcosis
System that transfers heat from one space to another
being used as a heat source, it can again take up energy from the heat source, be compressed, and repeat the cycle. Air source heat pumps are the most
Heat_pump
Chamber for transporting divers vertically through the water
operate as a base or a means of transport for a small number of divers. Air is trapped inside the bell canopy by pressure of the water at the interface
Diving_bell
Instrument to calculate decompression status in real time
types may be used. Double straps may be used for greater security. An alternative to straps is console mounting, usually limited to puck form factor recreational
Dive_computer
Equipment designed to help protect an individual from hazards
type of respirator protects users by providing clean, respirable air from another source. This type includes airline respirators and self-contained breathing
Personal_protective_equipment
Situation that endangers the life or health of a diver
filling procedures and often a problem of contaminated intake air. Bailout to another gas source is the preferred option, but it may be necessary to surface
Underwater_diving_emergency
Machine used to compress breathing air for use by underwater divers
A diving air compressor is a breathing air compressor that can provide breathing air directly to a surface-supplied diver, or fill diving cylinders with
Diving_air_compressor
leg linked by an articulating joint to a mooring. alternative air source A secondary supply of air or other breathing gas used by a diver in an emergency
Glossary of underwater diving terminology: A–C
Glossary_of_underwater_diving_terminology:_A–C
Equipment used specifically for surface supplied diving
have an "out-of-air" emergency than a scuba diver using a single gas supply, as there are normally two alternative breathing gas sources available. Surface-supplied
Surface-supplied diving equipment
Surface-supplied_diving_equipment
Watertight clothing that seals the wearer from cold and hazardous liquids
for use in cold water. Dry suits can be uncomfortably hot in warm or hot air, and are typically more expensive and more complex to don. For divers, they
Dry_suit
2011 film by Duncan Jones
Source Code is a 2011 science fiction action thriller film directed by Duncan Jones and written by Ben Ripley. It stars Jake Gyllenhaal as a US Army officer
Source_Code
Injury due to pressure difference between gas filled space and adjoining tissue
(the under-pressure air space is inside the diving mask or swimming goggles) Skin (when wearing a diving suit which creates an air space) Brain and cranium
Barotrauma
Anglo-Irish scientist (1627–1691)
chemist and physicist Henry Cavendish used the term "factitious air" to refer to "any kind of air which is contained in other bodies in an unelastic state,
Robert_Boyle
Hyperbaric pressure vessel for human occupancy used in diving operations
"decompression sickness" came from using air pressure in mining and construction, pressurized tunnel boring machines use air pressure to force water out of the
Diving_chamber
Sharing air using an octopus regulator octopus regulator A secondary demand valve fitted to a diving first stage for use as an alternative air source for
Glossary of underwater diving terminology: H–O
Glossary_of_underwater_diving_terminology:_H–O
Breathing gas, mixture of nitrogen and oxygen
distinguished from air and handled differently. The most common use of nitrox mixtures containing oxygen in higher proportions than atmospheric air is in scuba
Nitrox
Hypothetical source of gospel contents
The Q source (also called the Sayings Gospel, Q Gospel, Q document(s), or Q; from German: Quelle, meaning "source") is a hypothesized written collection
Q_source
Ascent to the surface by a diver in an emergency
and is not necessarily an emergency ascent depending on which alternative air source is used, and may be independent or dependent also depending on whose
Emergency_ascent
Cylindrical container for storing pressurised gas
capacity from 0,5 L to 3000 L, and may be refillable or non refillable. Alternative terms include "transportable gas containers" and "transportable pressure
Gas_cylinder
Cloudiness of a fluid
strength) of light as it passes through a sample column of water. The alternatively used Jackson Candle method (units: Jackson Turbidity Unit or JTU) is
Turbidity
Opening in the base of a hull, platform, or chamber giving access to the water below
complete chamber, not just the opening in the bottom and the air–water interface. The alternative to a moon pool in an underwater habitat is the lock-out chamber
Moon_pool
Scuba cave diving incident in South Australia
guideline, and subsequently became lost, eventually exhausting their breathing air and drowning, with their bodies all recovered over the next year. To date
1973 Mount Gambier cave diving accident
1973_Mount_Gambier_cave_diving_accident
List of articles related to underwater diving grouped by topical relevance
life jacket (ABLJ) – Chest inflation type buoyancy compensator Alternative air source – Emergency supply of breathing gas for an underwater diver AR vest
Outline_of_underwater_diving
Hypothetical devices to extract oxygen from water
diver's or climber's breathing by concentrating O2 from seawater or from thin air at altitude, and venting CO2". Undersea and Hyperbaric Medicine (Annual Meeting
Artificial_gills_(human)
Dredging device using injected air to move water and entrained load up a pipe
sea bed and to transport the resulting debris upwards and away from its source. It is a type of suction dredge. A water dredge or water eductor may be
Airlift_(dredging_device)
Part of the vertebrate circulatory system
both air and blood, rather than air alone (which was essentially correct, leaving aside that blood vessels carry constituents of air and not air itself)
Pulmonary_circulation
Equipment used to facilitate underwater diving
side mounted and open circuit regulator(s), or rebreather sets. Alternative air source such as bailout bottle or pony bottle, and decompression cylinders
Diving_equipment
Container to supply high pressure gas for diving operations
safely make a free ascent, or where a buddy is available to provide an alternative air supply in an emergency, recreational divers usually carry only one
Diving_cylinder
Copper helmet with rubberised canvas diving suit and weighted boots
a complete loss of air, and the diver sinking to the bottom to drown. The standard diving system had no self contained alternative breathing gas supply
Standard_diving_dress
Device that generates controlled seismic energy used for seismic surveys
it can use more sophisticated technology, such as a specialized air gun. Seismic sources can provide single pulses or continuous sweeps of energy, generating
Seismic_source
This is a list of alternative rock artists. Bands are listed alphabetically by the first letter in their name (not including "The"), and individuals are
List of alternative rock artists
List_of_alternative_rock_artists
Self-contained underwater breathing apparatus
carry their own source of breathing gas, usually filtered compressed air, allowing them greater freedom of movement than with an air line or diver's umbilical
Scuba_set
Presence of dangerous substances in the air
agriculture. Indoor air pollution is often from burning firewood or agricultural waste for cooking and heating. Other sources of air pollution include dust
Air_pollution
Forensic investigation of underwater diving accidents
low oxygen content may indicate hypoxia if there is no evidence of an alternative cause of low oxygen levels. The content of the cylinders is also measured
Investigation of diving accidents
Investigation_of_diving_accidents
Body fluid leakage in the lungs while swimming
scuba equipment may cause a negative pressure difference between the air-source and lung centroid, which will cause a greater leakage of fluid into the
Swimming-induced pulmonary edema
Swimming-induced_pulmonary_edema
American novelist and underwater explorer (1931–2020)
War I. Furthermore, one of Cussler's uncles served in the Imperial German Air Service and became a flying ace, shooting down 14 Allied aeroplanes. He was
Clive_Cussler
List of terms used in underwater diving and their meanings in context
(CCR) (q.v.). 2. Surface Consumption Rate - An alternative term with the same meaning as Surface Air Consumption (SAC) (q.v.). Not to be confused with
Glossary of underwater diving terminology: P–S
Glossary_of_underwater_diving_terminology:_P–S
Swimming while inhaling through a snorkel
practice of swimming face-down in a body of water while breathing the ambient air through a shaped tube called a snorkel, usually with swimming goggles or
Snorkeling
Diving mask that covers the mouth as well as the eyes and nose
breathing apparatus.[citation needed] Emergency provision of an alternative breathing gas source is required in case of a failure of the primary gas supply
Full-face_diving_mask
American cave and deep diving pioneer and record breaker
as a backup in the event the diver's primary second stage fails, or alternatively, to allow the diver and their buddy to have simultaneous access to the
Sheck_Exley
51% of India's air pollution is caused by industrial pollution, 27% by vehicles, 17% by crop burning and 5% by other sources.[better source needed] Emissions
Air_pollution_in_India
Underwater sport using recreational open circuit scuba equipment in a swimming pool
regulator designed for open circuit scuba and fitted with both an alternative air source for use during the Obstacle Course event (refer below) and a submersible
Sport_diving_(sport)
Methods bringing energy into production
energy growing, the need to adopt various energy sources is growing. Energy conservation is an alternative or complementary process to energy development
Energy_development
List of aircraft operated by Air India
lacks a breakdown by aircraft type, requiring the use of alternative sources for this section. "Air India eyes up to 100 more widebody aircraft - report"
Air_India_fleet
Underwater diving under ice
freezes open, the low pressure air can be shut off to the frozen second stage allowing them to switch to the alternative second stage and abort the dive
Ice_diving
Diving beyond the scope of recreational diving
equipment involves breathing gases other than air or standard nitrox mixtures, and multiple gas sources. Most technical diving is done within the limits
Technical_diving
software § Free and open-source software List of Unix commands AlternativeTo CodePlex Free Software Directory Freecode Open Hub SourceForge AlmaLinux OS Foundation
List of free and open-source software packages
List_of_free_and_open-source_software_packages
Planned hyperbaric exposure using a specified breathing gas as medical treatment
cases the use of breathing gases with oxygen content greater than that of air. A large number of hyperbaric treatment schedules are intended primarily
Hyperbaric treatment schedules
Hyperbaric_treatment_schedules
Arrangement and function of the components of regulators for underwater diving
freezes open, the low pressure air can be shut off to the frozen second stage allowing them to switch to the alternative second stage and abort the dive
Mechanism of diving regulators
Mechanism_of_diving_regulators
Diving using equipment configuration where scuba sets are clipped to the diver's sides
harness can be lighter and less bulky than back-mounted alternatives – allowing for easier and cheaper air travel. Unlike back-mounted cylinders, the sidemount
Sidemount_diving
Temperature control on the London Underground
(66–79 °F) and air temperatures in the tunnels now reach as high as 30 °C (86 °F). Heat is extracted from the tunnels using ventilation shafts, with air forced
London_Underground_cooling
Estimation of breathing gas mixtures and quantities required for a planned dive profile
and Mitchell, but more than their preferred limit of 5.2 kg/m3 Alternative air source – Emergency supply of breathing gas for an underwater diver Bailout
Scuba_gas_planning
Canadian astronaut (born 1976)
Jeremy Roger Hansen (born January 27, 1976) is a Royal Canadian Air Force colonel and CSA astronaut. As a mission specialist on Artemis II in April 2026
Jeremy_Hansen
Terpene hydrocarbon
fragrant alternative to turpentine. Limonene is also used as a solvent in some model airplane glues and as a constituent in some paints. Commercial air fresheners
Limonene
Processes to develop the skills and knowledge to dive safely underwater
diving, Module C is inshore air diving to 30 msw and associated underwater work, Module D is surface supplied offshore air diving to 50 msw using a wet
Diver_training
American astronaut and USAF colonel (born 1967)
(born March 14, 1967) is an American astronaut and retired United States Air Force colonel. He is fourth among NASA astronauts ranked by time spent in
Michael_Fincke
Swiss physicist, inventor, and explorer
an air-thin black-and-silver aluminum ball. Within [the contraption] Prof. Auguste Piccard, physicist, and Charles Kipfer aimed to explore the air 50
Auguste_Piccard
Buoy towed by a scuba diver to indicate position
difficult to deploy safely if the gas source is not carried by the buoy. There are at least four methods of keeping the air in the inflated decompression buoy
Surface_marker_buoy
Ballast carried to counteract buoyancy
stops. During the dive, buoyancy is controlled by adjusting the volume of air in the buoyancy compensation device (BCD) and, if worn, the dry suit, in
Diving_weighting_system
Underwater diving procedures
that it cannot be supported by the buoyancy compensator. In this case alternative measures must be taken. The simplest case is to ditch sufficient ballast
Surface-supplied diving skills
Surface-supplied_diving_skills
Study of the propagation of sound in water
long range it is dominated by absorption and/or scattering losses. An alternative definition is possible in terms of pressure instead of intensity, giving
Underwater_acoustics
Technology that allows survival in hostile environments
ECLSS when describing these systems. The life-support system may supply air, water and food. It must also maintain the correct body temperature, an acceptable
Life-support_system
European beyond visual range air-to-air missile
The Meteor is a European active radar guided beyond-visual-range air-to-air missile (BVRAAM) developed and manufactured by MBDA. It offers a multi-shot
Meteor_(missile)
Safe isolation of dangerous equipment during maintenance or testing
hazardous energy sources be "isolated and rendered inoperative" before work is started on the equipment in question. The isolated power sources are then locked
Lockout–tagout
Method of carbon capture from carbon dioxide in air
strength, creating carbon-neutral concrete alternative, enhancing productivity of algae farms, enrichment of air in greenhouses liquid fuels enhanced coal
Direct_air_capture
Method of gases separation using selective adsorption under pressure
technique used to separate some gas species from a mixture of gases (typically air) under pressure according to the species' molecular characteristics and affinity
Pressure_swing_adsorption
Basis for the published decompression tables and algorithms
Revision 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
US Navy decompression models and tables
US_Navy_decompression_models_and_tables
Power generation via movement of water
coal shortages pushed governments and utility companies to seek alternative power sources. Early on, Switzerland dammed the Alpine rivers and the Swiss
Hydropower
Mechanism that controls the pressure of a breathing gas supply for diving
called an alternate air source, and is also a fully redundant air source, as it is totally independent of the primary air source, which has safety advantages
Diving_regulator
Rigid head enclosure for underwater diving
overhead, and may also be used to mount lights and video cameras. An alternative to the diving helmet that allows communication with the surface is the
Diving_helmet
Line from which something (air, noise, radiation, etc.) emanates
A line source, as opposed to a point source, area source, or volume source, is a source of air, noise, water contamination or electromagnetic radiation
Line_source
2025 video game
claimed the game is a "casual-friendly alternative" to Mario Kart World, with the assumption that they may prefer Kirby Air Riders for being a more "refreshing"
Kirby_Air_Riders
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
Male
Russian
(КиÌÑ€) Russian name KIR means "master, ruler."
Boy/Male
Egyptian
Air.
Female
Hebrew
(× Ö´×™×¨) Hebrew unisex name NIR means "to cultivate a field."
Male
Icelandic
Icelandic form of Old Norse VÃðarr, VIÃAR means "forest warrior."
Male
Hebrew
(×™Ö¸×ִיר) Variant spelling of Hebrew Yaiyr, YAIR means "whom God enlightens."Â
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi
Air
Male
Finnish
 Pet form of Finnish Aaroni, ARI means "light-bringer." Compare with other forms of Ari.
Male
English
 Anglicized form of Hebrew Yaiyr, JAIR means "whom God enlightens." In the bible, this is the name of several characters, including a descendant of Manasseh. Anglicized form of Hebrew Yauwr, meaning "forested." In the bible, this is the name of the father of Elhanan.
Male
Hebrew
(עַטִיר) Hebrew name ATIR means "crown, wreath."
Female
Welsh
Welsh form of Greek Maria, MAIR means "obstinacy, rebelliousness" or "their rebellion."
Boy/Male
Hindu
Air
Male
Icelandic
Icelandic form of Old Norse Hróarr, HRÓAR means "famous spear."
Male
Irish
Irish name LIR means "the sea." In mythology, this is the name of a god of the sea. He is identified with Welsh LlÅ·r.
Surname or Lastname
Scottish spelling of Irish Hare.English
Scottish spelling of Irish Hare.English : nickname for someone with some peculiarity of the hair, from Middle English here ‘hair’.
Male
English
Variant spelling of English Gare, GAIR means "spear."
Female
Norse
Old Norse name derived from the word eir, EIR means "help, mercy." In mythology, this is the name of a goddess of healing and medicine.
Boy/Male
Tamil
Air
Boy/Male
Hindi
Air.
Boy/Male
Arabic, Australian, German
Alternative of God
Male
Norse
Contracted form of Old Norse Hróðgeirr, HRÓARR means "famous spear."
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
Male
English
 English form of Welsh Kai, KAY means "lord." In Arthurian legend, this is the name of one of the first Knights of the Round Table. He was the son of Sir Ector, the foster brother of King Arthur, and is noted for having an acid tongue and boorish behavior, but mostly for trying to take credit when Arthur pulled the sword from the stone. Compare with another form of Kay.Â
Male
Scottish
Scottish name LAIRD means "landowner."
Girl/Female
Hindu
Goddess Saraswathi, Name of a Raga
Boy/Male
Finnish, German
Protected by God; God-helmet
Girl/Female
Indian
Dark flower, Dark grey eyes
Girl/Female
Australian, Japanese
Cold Wind
Girl/Female
Tamil
Life, Immortal
Girl/Female
Muslim
Patient, Tolerant
Girl/Female
Tamil
Lightning
Surname or Lastname
English
English : possibly a variant of Smock.
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
ALTERNATIVE AIR-SOURCE
p. pr. & vb. n.
of Alternate
n.
Air in motion; a light breeze; a gentle wind.
n.
Any aeriform body; a gas; as, oxygen was formerly called vital air.
n.
Odoriferous or contaminated air.
n.
A particular state of the atmosphere, as respects heat, cold, moisture, etc., or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc.
a.
Consisting of air; as, an airy substance; the airy parts of bodies.
a.
Open to a free current of air; exposed to the air; breezy; as, an airy situation.
a.
Alternate; reciprocal.
n.
To expose to heat, for the purpose of expelling dampness, or of warming; as, to air linen; to air liquors.
a.
Relating or belonging to air; high in air; aerial; as, an airy flight.
adv.
In the manner of alternatives, or that admits the choice of one out of two things.
a.
Slacked, or pulverized, by exposure to the air; as, air-slacked lime.
a.
So tight as to be impermeable to air; as, an air-tight cylinder.
n.
The reciprocal succession of things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear.
n.
Alternate succession; alternation; a mingling.
a.
Drawn in air; imaginary.
a.
Disjunctive; as, an alternative conjunction.
n.
Either of two things or propositions offered to one's choice. Thus when two things offer a choice of one only, the two things are called alternatives.
n.
To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; as, to air a room.
n.
The peculiar look, appearance, and bearing of a person; mien; demeanor; as, the air of a youth; a heavy air; a lofty air.