Reena's mother put some raisins in the kheer she prepared for her birthday. Reena was surprised to see the raisins were all swelled up. This happened because
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Resins swells because of higher concentration of water in it through diffusion.
Explanation: The dried resin has low concentration of water but when it is used in making kheer, it's surroundings have concentration of water. Due to higher concentration and lower concentration diffusion took place and water entered into resin and due to it resin swollen up.
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