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Macemore t1_j1okhki wrote

Reply to comment by fishman1287 in How is density measured in porous materials? by That_Lego_Guy_Jack

That is why you use the water, it's a tool in this case to measure the sponge's cavities. By using a known metric (water) and volume (1L) and calculating the differences before/after the absorption you can determine the quantity of water in the sponge. If you know how much water is in there, and you know how much space water takes, you know how much space is empty in the sponge.

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