General Knowledge - General Science - Discussion


The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

[A]. Argon
[B]. Xenon
[C]. Helium
[D]. Krypton

Answer: Option C


No answer description available for this question.

Tinni Choudhury said: (Sep 30, 2010)  
Since Helium is a inert gas and makes no reaction.

Pranay said: (Jan 22, 2011)  
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.

Balakrishna said: (Jan 26, 2011)  
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.

Shan said: (Feb 21, 2011)  
All given option exept helium having lower diffusion rate and hence can not be used.

Pulkit said: (May 15, 2011)  
Because nitrogen gas cause a disease called BENT which can also cause death. That's helium is used.

Jagdeesh Kumawat said: (Oct 23, 2011)  
Helium is nontoxic & no adverse effect in veins.

Hitender Yadav said: (Oct 27, 2011)  
Why Krypton or Xenon not use they are also inert gases ?

Pushpa said: (Mar 5, 2012)  
What is the chemical formula of krypton ?

Yadu said: (Apr 4, 2012)  
But why inert gas is mixed with oxygen during deep sea diving?

Kriti said: (Jul 7, 2012)  
Well, oxygen does not dissolve directly into blood under high pressure existing in the deep sea, hence inert gas like helium is mixed with oxygen during deep sea diving. I hope its clear.

Ratan Siyag said: (Feb 6, 2013)  
Oxygen get solid state under high pressure. So, it does not dissolve into blood under high pressure existing in the deep sea. Helium helps to keep it gas state.

Abdus Salam said: (Jul 4, 2013)  
Deep sea divers take oxygen mixed with inert gas say He and adjust the partial pressure of oxygen according to the requirement. Actually, in sea after every 100 feet depth, the divers experiences approximately 3 atm pressure, subnormal air cannot be breathed in depth of sea, moreover, the pressure of n2 increases in depth of sea and it diffuses in the blood.

Monu Jaat said: (Sep 15, 2013)  
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.

Narayana Reddy said: (Nov 6, 2013)  
Helium is non toxic and lightest gas in inert gasses.

Farhan said: (Dec 14, 2013)  
Helium is a non toxic that doesn't react with blood.

Mohammed.Aakif.K.A. said: (Feb 24, 2014)  
Nitrogen react with blood vessels and causes bends. While helium is inert gas does not reacts with bloods.

Prashant said: (Apr 6, 2014)  
Nitrogen is a toxic gas which can't burn but mix with blood. It makes the blood toxic and when the divers comes out, their vessels bursts but helium does not react.

M.Yaseen Raza said: (May 4, 2014)  
Helium is not harmful for humans and it work like oxygen in the depth of the sea.

Bhupender Kumar said: (Jun 9, 2014)  
Helium is helpful to prevent the mixing of air in blood vessels and divers safe from death region.

Nana Gyamfi said: (Jun 11, 2014)  
Yeah is true helium is helpful to resist the mixing of air in blood.

Gaurav said: (Aug 19, 2014)  
As deep sea divers are under very high pressure of water, at that pressure oxygen are not able to dissolve in our blood so helium is used to fulfill the requirement.

Mrinal said: (Oct 7, 2014)  
Helium is an inert gas and is not toxic. However breathing pure helium is dangerous because it excludes needed oxygen. Deep sea divers can remain at depth only for controlled periods and must come up slowly and even remain at specified depths to avoid the bends. When ordinary air is used for diving the oxygen in the air is used up by the body but the nitrogen builds up to a new equilibrium state at the higher pressure required at great depths.

One danger that deep sea divers faced was that if they adjusted their air control valves improperly their suit might inflate preventing their hands from reaching the controls to correct the problem. They would then race all the way to the surface like a giant bubble. The excess nitrogen would then come out of tissues and form bubbles (like the fizz in a opened can of soda) in the blood causing the bends and great pain with possible death.

The diver could be placed in a re-compression chamber and pressurized to squeeze the nitrogen bubbles back into the tissues for controlled release during gradual decompression. The expanding nitrogen bubbles in tissues during rapid decompression may also drive away necessary oxygen leading to bone necrosis (bone death). One solution would be to use pure oxygen rather than pure air.

However pure oxygen can be toxic at great concentrations at depth. Therefore oxygen can be mixed with helium to reduce oxygen concentration while eliminating nitrogen. During controlled decompression the helium would also diffuse out of tissues and the lungs more easily than nitrogen avoiding the bends. Use of helium for relatively shallow scuba diving would likely permit longer diving times with less threat of the bends.

Dinkar said: (Apr 2, 2015)  
Since helium is a inert gas and lighter in weight. So it make oxygen up so that driver can respire properly and if it get mix with blood it have no bad effect and it is also not poisonous gas for human body while respiration.

Swati said: (Jun 5, 2015)  
Increased pressure in lungs during deep sea diving causes an increased solubility of all gases in the blood. On ascending too quickly, these gases can bubble out of the blood. This is a serious problem with nitrogen as the bubbles can rupture blood vessels causing "The bends".

The He atom is much smaller than the N2 molecule, has a smaller electron cloud and is less polarisable. It therefore is less soluble in blood than nitrogen and is preferred as the above dangers are reduced.

Priyanka said: (Aug 16, 2015)  
Thanks all of you for your explanations. They were really helpful.

Prathibha Patel said: (Aug 20, 2015)  
What is the meaning of Inert gas and why they call?

Darshit said: (Aug 27, 2015)  
Inert gas is what we breathe. The gas used by sea divers when they dive is called inert gas.

Aniket Ramesh Borge said: (Oct 3, 2015)  
The ionic bond is strong bond not covalent bond.

Aps said: (Jul 4, 2016)  
Argon and Krypton being inert gases can't be used since they dissolve in blood with increasing pressure.

Nishant Sharma said: (Aug 15, 2016)  
Helium is used by sea diver instead of Nitrogen because helium is not react with blood while nitrogen react with blood this cause pain in human body so helium is used because it cause less pain.

Leki Wangmo said: (Sep 14, 2016)  
Helium cannot react with the other gas and so it is an inert gas.

Prasanna said: (Sep 23, 2016)  
Thank you all for an explanation.

Irfan Maahir said: (Nov 7, 2016)  
Helium is the right answer.

Pavithran Of Sri Gurukulam Hosur said: (Dec 29, 2016)  
Heli-air is a form of trimix that is easily blended with helium and air without using pure oxygen. It always has a 21:79 ratio of oxygen to nitrogen; the balance of the mix is helium. Hydreliox is a mixture of oxygen, helium, and hydrogen and is used for dives below 130 metres in commercial diving.

Ijaz Ul Haq said: (Mar 19, 2017)  
Why other inert gases like xenon and krypton, are not used?

Akshita said: (Apr 8, 2017)  
Because helium is not harmful for human being and it was used as oxygen in deep sea.

Sasi said: (Jun 27, 2017)  
Helium is an inert gas and it can't make any reactions.

Chester said: (Jul 3, 2017)  
Helium - It is stable and lighter than other given gases hence it is easy to carry.

Ahmed Ismail said: (Jul 7, 2017)  
A mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for deep-sea divers and others working under pressurised conditions.

S.Vasanthi said: (Jul 24, 2017)  
Air which was first used in diving tanks contains roughly 20% oxygen and 80% nitrogen.

Gulabchand Patel said: (Sep 11, 2017)  
It is used as a diluent for oxygen in modern diving apparatus because of its very low solubility in blood.

Arpit Gupta said: (Oct 2, 2017)  
11.2% HELIUM is added.

Muhammad Tariq said: (Oct 29, 2017)  
Why real gases cannot be used in divers tank?

Praveen Prajapati said: (Jan 9, 2018)  
The mixture of oxygen and hilleum are used by sea driver.

Mallesh Goud said: (Mar 9, 2019)  
Thank you all for providing the information.

Alok Thakur said: (Jun 4, 2019)  
Helium is the lightest gas and does not cause any harm to the body that's why it is used by deed divers. Thanks.

Rk said: (Jul 17, 2019)  
Helium is just mixed to reduce the solubility of nitrogen into the blood at extreme depth underwater.

Otherwise, it causes bents (pain due to sudden evaporation of nitrogen when diver comes out of water).

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