What is Nitrogen narcosis?
'''Nitrogen narcosis''' is a problem for [[Underwater diving|underwater divers]]. It affects the brain and [[nervous system]] a lot like [[alcohol]], but goes away when the diver rises to a shallower depth. It does not have lasting effects after the depth is reduced. ==People affected== Any underwater diver who goes deeper than 30 m (100 ft) while breathing air, or any time when the pressure of [[nitrogen]] in the breathing gas is more than about 3,2 bar. ==Prevention== Nitrogen narcosis only happens when the pressure of nitrogen is high. If the pressure is kept low by staying at a shallower depth it will not happen. If the breathing gas has less [[nitrogen]] it will only start at a deeper depth. [[Helium]] gas can be used in place of nitrogen in breathing gas for divers to make it less likely to get nitrogen narcosis. ==What actually happens== The nitrogen gas dissolved in the diver affects the working of nerve cells. At higher pressures more nitrogen can be dissolved. It starts off as a mild effect like being slightly drunk, but as the pressure increases it gets more serious, like getting more drunk. Eventually the diver may lose consciousness. ==Problems== A diver who has nitrogen narcosis will have slower reactions and may not think clearly. If something goes wrong the diver may not be able to cope with the problem. This can be dangerous. ==Treatment and fix== The diver can move to a shallower depth or change to a different breathing gas with less nitrogen. This will usually be a mixture containing helium. == Related pages == * [[Heliox]] * [[Scuba diving]] [[Category:Safety]] [[Category:Health problems]] [[Category:Nitrogen]]