Scuba Diving - Glossary

Air	21% Oxygen, 78% Nitrogen and 1% other gases
ABLJ	Adjustable Buoyancy Lifejacket
Ambient Pressure	Surrounding pressure
Anoxia	No Oxygen
Aqualung	Air Cylinder, Regulator & Harness
Ar	Argon
ATA	Atmosphere absolute. 1 ATA is the atmospheric pressure at sea level
AV	Artificial Ventilation
BAR	Barometric pressure
BC	Buoyancy Compensator
Bends	Decompression Illness
BSAC	British Sub Aqua Club
Buddy	Diving Partner
CMAS	World Underwater Federation
CO	Carbon Monoxide
CO2	Carbon Dioxide
DAN	Divers Alert Network
Deco	Decompression
DCI	Decompression Illness
DCS	Decompression Sickness
DSMB	Delayed Surface Marker Buoy
EAN(x)	Enriched Air Nitrox
END	Equivalent Narcotic Depth
He	Helium
Heliox	Oxygen & Helium
HW	High Water
Hyperbaric Chamber	Used to treating Decompression Sickness
Hypercapnia	physiological condition that results from too much Carbon Dioxide
Hypoxia	Reduction in Oxygen
IAND	International Association of Nitrox Divers
IANTD	International Association of Nitrox & Technical Divers
LW	Low Water
MOD	Maximum Operating Depth
Narced	Nitrogen Narcosis
Nitrogen Narcosis	Intoxicated due to raised partial pressure of Nitrogen
Nitrox	Air containing more than 21% Oxygen
O2	Oxygen
Octopus	Spare Regulator for emergency use
Octopush	Under water hockey
PADI	Professional Association of Diving Instructors
PFO	Patent Foram Ovale
pp	Partial Pressure
PSI	Pounds per Square Inch
Purge Valve	Valve for clearing a regulator
SCUBA	Self-Contained Underwater Breathing Apparatus
TDI	Technical Diving International
Trimix	Oxygen, Nitrogen & Helium
UPTD	Unit Pulmonary Toxic Dose
Valsalva Manoevre	Ear Clearing