Scuba Diving Glossary

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RECREATIONAL DEPTHS: A term used to define diving at depths above 130 feet.

RECREATIONAL SCUBA DIVING: Diving to prescribed limits, including a depth no greater than 130 fsw, using only compressed air, and never requiring a decompression stop.

REGULATOR: In Scuba, any device that changes air pressure from one level to a lower level.

REPETITIVE DIVE: Any dive whose profile is affected by a previous dive is considered repetitive.

RESIDUAL NITROGEN TIME: The time it would take to off-gas any extra nitrogen remaining after a dive. Residual nitrogen time is always taken into consideration when determining the safe duration for any repetitive dive.

REVERSE SQUEEZE: Pain or discomfort in an enclosed space (e.g., sinuses, middle ear, inside mask) on ascent from a dive.

RULE OF THIRDS: An air management technique. Use a third of the tank to get to your destination, a third to get back, and the last third belongs to your buddy in case of an emergency.