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220 Reg ulator: The piece of equipment that reduces high-pressure air in the scuba cylinder to ambient pressure on demand. Rel ative Humidity: The amount of water held in the air compared to what the air can hold at that temperature. Rep etitive Dive: Any dive made before complete outgassing from a previous dive. On the NAUI Dive Tables, this is 24 hours. Req uired Decompression Stop: An amount of time specified by dive tables, a calculator, or a computer that must be spent at a specific depth whenever the Maximum Dive Time is exceeded. Res idual Nitrogen: The dissolved nitrogen remaining in the body because of a previous dive or dives. Rev erse Block: The opposite of a squeeze. The situation that exists when the internal pressure of an air space is greater than the external pressure and blocks its own escape route by deforming body tissues. Rip Current: A current that results when water pushed up on the beach by waves rushes back to the sea through a narrow channel. RNT: Residual Nitrogen Time. S SAC Rate: Surface Air Consumption Rate. Safety Stop: See Precautionary Decompression Stop. Scr olling: A sequential display on a dive computer between dives to provide the Maximum Dive Times for various depths, on the next dive, or other lists of data. Scu ba: Self-contained underwater breathing apparatus. Scu ba Diver Course: The first course in NAUI’s complete diver education program. This course leads to certification. Scu ba Cylinder: The piece of equipment containing the high pressure air to be breathed while underwater. Ser vice Pressure: The working pressure of the scuba cylinder. It is stamped on the shoulder of the cylinder. Sin us: An air cavity in the skull lined with mucus membranes. Sinuses can cause problems with equalizing if they are blocked because of swelling, as with colds or allergies. SIT: Surface Interval Time. Ski p Breathing: The hazardous practice of taking a breath and holding it as long as possible before exhaling while scuba diving. This practice is done to supposedly extend bottom time. Sno rkel: A tubular piece of equipment that allows a person to breathe while keeping their face in the water. SPG: Submersible Pressure Gauge. Squ eeze: The condition that results when the pressure outside an enclosed air space is greater than the internal pressure. Sta nding Current: A water flow that is constant and steady. Sub mersible Pressure Gauge: A piece of equipment that provides a display of tank pressure during a dive. Sur face Air Consumption Rate: The amount of air consumed at the surface in a set period. Sur face Interval Time: The time spent on the surface between dives. Ski n Diving: A type of diving that is done by holding your breath. Also known as free diving or breath-hold diving. NAUI Scuba Diver GLOSSARY


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