What Makes Pumice Float?

During it’s formation gasses become trapped.

This 3-D rendering, produced using X-ray microtomography at Berkeley Lab’s Advanced Light Source, shows a cube-shaped sample of pumice (blue-gray) and pockets of trapped gases (other colors). The X-ray studies helped scientists uncover how gas becomes trapped by surrounding liquid, causing pumice to float on the ocean’s surface for prolonged periods.
Credit: Berkeley Lab, UC Berkeley

Berkeley Lab

Trapped bubbles keep pumice afloat and gas diffusion makes pumice sink

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