Hey
In the case of the divers..deep underneath the pressure is very high that the gases are easily soluble in the blood in high concentrations..i.e.by the henry's law that the solubility is propotional to the partial pressure at low temperature.
when the divers reach the surface..the pressure decreases.. leading to the release of the dissolved gases such as Nitrogen , which leads to the formation of bubbles in blood..BENDS(blockage of the blood capillaries due to the bubbles)
To avoid these.. divers use helium in the tanks along with the air..:)
hope this helps u..:)vead
