Why not deep sea diver uses mixture of oxygen and nitrogen?
Answers
Answer:
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Explanation:
First of all the question is what is the need to mix any other gas with oxygen in an “oxygen tank”.
Oxygen cannot be directly inhaled since it is highly combustible and would start burning immediately. So it needs to be mixed with some other gas for your internals to not catch fire!
So the most probable gas which comes to mind is nitrogen since it is present in a large quantity in the normal air that we breathe in. The problem with it though, is that as you increase the pressure over a gas it starts becoming more and more soluble in a liquid present below it (Henry's Law). So, as deep sea divers go under the water, pressure increases and nitrogen starts dissolving in blood inside the blood vessels. If they come back to the surface of the water quickly and not gradually the nitrogen gas dissolved in blood vessels will convert back into gaseous phase and bubbles will start forming in the vessels which causes excruciating pain.
Helium however does not dissolve in blood to that extent because intermolecular Van der Waals’ forces in helium are extremely weak which make it almost non compressible.
Hence helium is used in oxygen tanks instead of nitrogen.
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Explanation:
Sea divers carry oxygen gas cylinders along with them because there is no free oxygen in the sea water since the little dissolved oxygen present in water can't be used for breathing by divers. It can be used only by aquatic animals