Question

why do moth balls disappear in cupboards? is it just magic?

Answer 1

The moth balls disappear in cupboards due to
Because it sublimes (changes directly from a solid to a vapor) at room temperature. Moth balls are vaporisable substance so they easily turn into vapour , they can turn into vapor because the intermolecular force is very weak so it easily vaporises to gas
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Answer 2

Hey !
Moth balls r naphthalene balls to b exact .
These are highly sublime , as due to their weak bonds , they need very less heat to evaporate.
That aint magic , thats science !