What does RNT stand for in SCUBA diving terminology?

Residual Nitrogen Time refers to the amount of nitrogen that remains in a diver's body after a dive. This is a crucial concept in SCUBA diving because it helps divers understand the residual effects of previous dives on their current dive planning. When a diver breathes compressed air, nitrogen is absorbed into their body tissues; after the dive, it takes time for that nitrogen to be eliminated.

Knowing the residual nitrogen levels is essential for divers to avoid decompression sickness, also known as "the bends," which occurs when nitrogen bubbles form as a diver ascends too quickly or makes subsequent dives without allowing adequate time for nitrogen to be released safely from the body.

Understanding RNT helps divers plan their surface intervals effectively, allowing them to dive again safely without risking their health. Thus, the term is integral to safe and informed diving practices.