Question

To avoid bends scuba divers use air diluted with helium give reason

Answer 1

Deep sea divers breathe compressed air. They then must be concerned about the solubility of gases in their blood. Hence, they ascend slowly to prevent dissolved gases from being released rapidly into their body fluids. The gas bubbles (like nitrogen) in the bodily fluids affect nerve impulses giving rise to decompression sickness or bends. These can be painful and fatal.

So, deep sea divers substitute Nitrogen with Helium in the air that they breathe because Helium is relatively less soluble in bodily fluids than Nitrogen.

The general composition of the air tank would be:

11.7 % Helium

56.2 % Nitrogen

32.1 % Oxygen

Hope this helped...

Answer 2

Answer:

This dilution of cylinders with helium gases save scuba divers to suffer from bends.

Explanation:

Scuba divers explore life forms and various other things in deep oceans. In deep oceans, external  pressure increases which is felt by scuba divers and to avoid any harmful effects of high pressure, scuba divers inhale high pressurized gas which has the mixtures of oxygen, nitrogen and other gases which neutralize the high atmospheric pressure. When scuba divers come near the surface of water then pressure decreases which decreases the solubility of gases like nitrogen and then the nitrogen gases exhaled by the scuba divers in bubble forms. These air bubbles sometimes get trapped in the blood vessels and block the capillaries. The air bubbles can also cause bands or decompression sickness which can be too dangerous or even fatal to scuba divers. So to avoid bends, the air cylinders are diluted with helium gases (heavy gas) which is relatively less soluble in blood and decreases the nitrogen concentration. Hence, this dilution of cylinders with helium gases save scuba divers to suffer from bends.

Therefore, scuba divers use helium gases in the cylinders

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