The combination of glue and water creates a physical change rather than a chemical change.
Physical changes are changes to the physical properties of materials and are usually reversible.
Chemical changes, on the other hand, are changes to the chemical properties of materials and are usually irreversible.
Mixing water with glue will only result in the glue being diluted with water and creates no chemical reaction. The glue can be recovered by distilling off the water.
Thus, mixing glues with water is only a physical change as the chemical properties of the glue remain intact.
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