Question

why do raisins placed in water swell up?

Answer 1

raisins placed in water swell up because of osmosis,
as the concentration of water is higher outside the raisins, so the water molecules start moving towards the lower concentration of water that is inside the raisins
and hence the raisins swell up

Answer 2

because of osmosis water enters into patience because in raisins there is low concentration of water and in outside surrounding there is high concentration of water O vinna dad and Osmosis the movement of water from high concentration to lower concentration acres so the resonance fired up