When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Give thre applications of the phenomenon.

Explanation

This happens due to a phenomenon known as osmosis, Raisin contains minside and oily lliuid which has a number of consituents present. When raisin is kept in water taken in a beaker or glass for sometime (may be overnigt), it swells in size. Actully water is hypotonic while the liquid of fluid inside the raisin is of hytpertonic nature. The outer wall of the raisin acts as a semipermeable membrane. There is an osmosis of water molecules insde the raisin trough this membrane and the raisin slowly swells in size.
For application of the phenomenon of osmosis, consult section 12.