What is the primary purpose of dive tables?

The primary purpose of dive tables is to help determine safe ascent rates and limits. Dive tables are specifically designed to provide divers with information about how to safely ascend from their dive depths to avoid decompression sickness, commonly referred to as "the bends." These tables are based on the principles of dive physics and physiology, taking into account factors like depth, time spent underwater, and the allowance for safe ascent rates to gradually remove nitrogen from the body.

Using dive tables allows divers to understand how long they can stay at particular depths and how they should ascend to prevent the formation of nitrogen bubbles in their tissues. This is critical for diver safety, as improper ascent can lead to serious health risks. Thus, dive tables are an essential tool in planning and executing a safe dive experience, focusing on the physiological considerations necessary for safe diving practices.