Question

raisins swell up when placed in water . why ?

Answer 1

a) Raisins are dried grapes. When they are placed in water, the water from the surrounding diffuses into the raisins and so the raisins swell up. The phenomenon involved is called osmosis. b) When swollen raisins are placed in concentrated sugar solution, they will shrink
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Answer 2

raisins swell up when placed in water because
the concentration of water is higher at outside then the cells so water will move inside the cells by the process of osmosis
hope this helps☺☺