218 Ent ry Scuba Experience Program: A NAUI program to introduce non-divers to scuba diving. This program does not award certification. Equ alization: The method of preventing and correcting squeezes. Also see Clearing. ESE Program: Entry Scuba Experience program. Eus tachian Tube: The tube that connects the middle ear with the throat, through which divers can equalize their ears. F Fin s: A piece of equipment that attaches a blade to the foot to increase the surface area of the foot to increase propulsion thrust. Foa m Neoprene: A rubber-based material saturated with tiny gas bubbles to provide insulation. This material is used to manufacture diving suits. G Gau ge Pressure: The pressure indicated by a gauge calibrated to ignore atmospheric pressure. Gog gles: A piece of equipment that only covers the eyes to prevent water from irritating them. Goggles are not an acceptable substitute for a mask. H Hea t Exhaustion: A condition resulting from overheating that is characterized by a pale, clammy appearance and a feeling of weakness. Hea t Stroke: A condition resulting from overheating that is characterized by hot, dry, and flushed skin. This is a life-threatening emergency. Hos e Protector: A piece of heavy plastic or rubber that fits over the end of a hose to relieve the stress caused by the weight of the equipment. Hyd rostatic Test: A test required to ensure the safety of scuba cylinders. This test is done using water as the medium to provide pressure to check the expansion and recovery of the scuba cylinder walls. Hyp erventilation: Breathing much more deeply and rapidly than required. This lowers the carbon dioxide level in the blood, which decreases the stimulus to breathe. I Ind ex Marks: The points on a compass bezel that provide a place to lay the needle to stay on a desired course. Int egrated Weight System: A system in which weight is combined with the backpack and buoyancy compensator. L Let ter Group Designation: A letter used to identify set amounts of residual nitrogen in a diver’s body after a dive. Lon gshore Current: A current that runs parallel to a coastline. Low -Pressure Inflator: A device that allows air from the scuba cylinder to be added to the buoyancy compensator. Lub ber Line: The reference line on a compass. The stationary line that shows the direction of travel. Lun gs: The organs of the body that allow oxygen to transfer from inhaled air to the blood. One of the body’s air spaces. M Mas k: A piece of equipment that holds a pocket of air around the eyes to improve underwater vision. The nose is always included in any mask to allow pressure inside it to be equalized. Max imum Dive Time: The length of time that can be spent at a given depth without being required to stop during ascent to reduce the likelihood of decompression sickness. NAUI Scuba Diver GLOSSARY
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