Question

why pumice floats in water

Answer 1

While scientists have known that pumice can float  because of pockets of gas in its pores, it was unknown how those gases remain trapped inside the pumice for prolonged periods.

If you soak up enough water in a sponge, for example, it will sink.

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Answer 2

$\huge\pink{Answer}$

While scientists have known that pumice can float  because of pockets of gas in its pores, it was unknown how those gases remain trapped inside the pumice for prolonged periods.