For deep diving, divers are made up of the gas mixture they breathe. In this mixture, nitrogen

For deep diving, divers are made up of the gas mixture they breathe. In this mixture, nitrogen, which is the main gas in the air, is replaced by helium. Explain what is the reason for such a replacement?

When submerged under water, the air pressure increases with every meter. Under these conditions, some gases become able to enter the body in a larger than normal body. For example, nitrogen is one of these gases. When immersed under water, nitrogen enters the body, dissolving in the blood. As the diver rises, the pressure will decrease, in such conditions the gas in the blood will take the form of bubbles. This can lead to a serious illness – decompression sickness. Helium does not dissolve in blood under reduced pressure, so it is used in a diving mixture.