why pumice rock can float in water
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Pumice floats on water because it has an incredibly low density due to the air bubbles inside of it. As it is blown out of a volcano (extrusive igneous), and dissolved gasses exsolve and more air gets into it before it hardens into pumice. The less dense air offsets the more dense rock, causing it to float.
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Pumice stones. 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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