Question

why do doctors advice gargle by saline water in case of sore throat?

Answer 1

Dear Student,
Osmosis is the movement of a solvent across a semipermeable membrane toward a higher concentration of solute from low concerntrated solution.
Doctors advice to gargle by saline water in case one has sore throat as relief is observed in ones throat due to the process of osmosis.
Saline water in this case act as a hypertonic solution hence fluids causing irritation and sore throat comes out with saline water.

Regards