Question

Which of the following gas mixture is used by sea drivers for respiration?
A.${O_2} + He$
B.${O_2} + Xe$
C.${O_2} + Ar$
D.${O_2} + {N_2}$

Answer 1

We need to know that sea diving is underwater diving with surface equipment. It is a very risky human activity as the driver is exposed to a wide range of hazards, such as breath hold endurance limitations. There are many medications given to the patients while having difficulty in breathing. Heliox is given to people who suffer from breathing problems.

Complete answer:
We have to know that the immersion of the human body in water affects breathing, circulatory system, renel systems and also disbalances the fluid in a body. This is because internal blood pressure is supported by the external hydrostatic pressure. Due to which blood shifts from limbs to chest. Due to this diving practice, the rate of heartbeat slowed down. The reduction in internal oxygen will increase the level of carbon dioxide in the blood which results in drowning. That is why surface equipment is provided to the sea drivers. The breathing gas mixture is supplied from a face mask. Thus the gas mixture is heliox which is a mixture of helium and oxygen. The proportion of oxygen in the gas mixture depends upon the depth of the drive plan which is approximately ten percentages.

Note:
We need to know that the sound travels faster in heliox than in air. A less expensive alternative to heliox is a trimix, that is a mixture of three gases which consists of helium, oxygen and nitrogen. The proportion of oxygen in the gas mixture depends upon the depth of the drive plan which is approximately $10\%$.