What does it mean when we say nitrogen is an inert gas?

When we describe nitrogen as an inert gas, we refer to its chemical behavior in the body. Inert gases are those that do not participate in metabolic processes or reactions. When we breathe nitrogen, which makes up about 78% of the air we inhale, our bodies do not utilize it for any biological functions. Since it does not react or combine with other elements in our body during respiration, it's simply exhaled without being processed.

Understanding this characteristic of nitrogen is crucial in diving because it has implications for dive planning and safety. Since it doesn't affect metabolic processes, nitrogen can accumulate in the body at deeper depths, leading to the potential for nitrogen narcosis or decompression sickness as divers ascend. Hence, being aware of how our bodies interact with nitrogen is vital for safe diving practices.