What factor is essential when planning a dive regarding nitrogen absorption?

When planning a dive, the time spent at each depth is essential due to its direct impact on nitrogen absorption. As a diver descends and remains at a specific depth, the partial pressure of nitrogen increases, leading to greater absorption of nitrogen into the body's tissues. The longer a diver stays at depth, the more nitrogen is absorbed, which can increase the risk of decompression sickness if the diver ascends too quickly or does not allow sufficient time for off-gassing the absorbed nitrogen during the ascent and safety stops.

Understanding the concept of nitrogen loading is critical for dive planning, as divers must account for both the duration of time spent at depth and the depth itself to establish safe dive profiles. This consideration helps ensure that divers follow safe practices to avoid complications related to nitrogen saturation in the body during and after their dives.