What is the primary reason for decompression tables?

Decompression tables are crucial tools used in diving to ensure safe ascent. During a dive, as divers descend and spend time at varying depths, their bodies absorb nitrogen from the breathed air due to increased pressure. If a diver ascends too quickly, nitrogen can form bubbles in the bloodstream and tissues, leading to decompression sickness (commonly known as "the bends"), which can be serious or even fatal.

Decompression tables provide divers with specific ascent profiles that outline how long a diver can safely spend at various depths and how to gradually ascend to the surface. By following these tables, divers can minimize the risk of nitrogen bubbles forming in their bodies, thus ensuring a safe ascent back to the surface. This fundamental understanding of pressure, depth, and time is essential for maintaining the health and safety of all divers.