Chemistry - Complete Pblock- Question with Solution | TestHub

A mixture of $2\%{\mathrm{O}}_2$ and $98\%$ He is used in diving apparatus which gives the same partial pressure of ${\mathrm{O}}_2$ as in normal air at $1\mathrm{atm}$. Due to high partial pressure and greater solubility, ${\mathrm{N}}_2$ gets dissolved in blood and form bubbles (bends or decompression sickness). Hence, ${\mathrm{N}}_2$ is replaced by helium which is much less soluble in biological fluids.