General Knowledge - General Science - Discussion

It is used as a diluent for oxygen in modern diving apparatus because of its very low solubility in blood.

11.2% HELIUM is added.

Why real gases cannot be used in divers tank?

The mixture of oxygen and hilleum are used by sea driver.

Thank you all for providing the information.

In past time hydrogen is added with nitrogen,they react with each other & forms NH3. Under deep sea, the solubility of the NH3 gas increase with pressure or water head. that NH3 dissolve in blood. when person comes out from sea then concentration of NH3 bubbles produce pain in his body.

At first nitrogen was used but since it dissolves in the blood when the pressure is high and becomes toxic, so helium is used as it does not dissolve in the blood and is non toxic.

Helium is the substitute for Nitrogen in the deep sea divers their oxygen cylinders contains oxygen with Helium when they were using Nitrogen in the cylinders they found that the divers when they come to the land because of difference in pressure theirs veins get bursted and they used to get bends in their legs and hands.With helium it is not observed as the rate of diffusion of He is greater than nitrogen along with it's non poisonous nature make it suitable to use.

All given option exept helium having lower diffusion rate and hence can not be used.

Because nitrogen gas cause a disease called BENT which can also cause death. That's helium is used.