Question

Why do the deep-sea fish die when brought to the surface?

Answer 1

This can be better understood with the help of Boyle's law which states that-

“Temperature remaining constant, the volume of a given mass of a gas is inversely proportional to its pressure.”

If T= constant

$\mathrm{V}\mathrm{is}\mathrm{inversaly}\mathrm{propotional}\mathrm{to}\frac{1}{\mathrm{P}}$

which means,

$\mathrm{PV}=\mathrm{K}$

Now we can understand that volume will increase drastically when the pressure will decrease.

The deep-sea fishes contain vacuoles in their cell in which fluids are filled and when we brought them to the surface the pressure will drastically decrease and hence the volume will increase drastically which result in the bursting of the vacuoles and ultimately death of the fishes.