What is the difference in nitrogen absorption rate between air and EANx?

The correct response highlights that EANx (Enriched Air Nitrox) allows for slower nitrogen absorption rates due to its lower nitrogen content compared to regular air. Normal air is composed of approximately 78% nitrogen, while EANx typically has a higher concentration of oxygen and a correspondingly lower concentration of nitrogen. This reduction in nitrogen content means that when divers use EANx, their bodies absorb less nitrogen.

Slower nitrogen absorption is advantageous for divers because it reduces the risk of nitrogen narcosis and decompression sickness during dives. This property is particularly beneficial for repetitive dives or longer bottom times, as it allows for safer ascent rates and more time spent at deeper levels.

The other choices focus on the rates of nitrogen absorption but do not provide the correct context or facts surrounding the effects of nitrogen's concentration in breathable gas mixtures. Understanding the composition of gas mixtures used in diving helps divers make informed decisions regarding their diving practices and safety protocols.