Question

Why does paper expand on drying after kept in water ?​

Answer 1

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$\huge{\mathfrak{\red{Answer}}}$

$<font color ="purple"><b>$The paper expands to some degree when hydrated. When drying, different parts of the paper dry at slightly different rates due to slight differences in the surrounding area and the slight randomness with which water evaporates. As it finishes drying, these variations become fixed.

Moisture generally evaporates from the exposed surface, but the surface against the paper membrane also evaporates at a much slower rate. Flattening is achieved because the margins of the support are attached to the drying board while the support shrinks (dries).
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