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How does filtration separate a substance that dissolves from one that does not dissolve?

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Filtration uses pressure to move a liquid through a semi-permeable membrane. Think of a coffee maker, where the hot water is pulled through coffee grounds and a filter stops most of the particles from ending up in the pot. The smaller particles are dissolved, so they pass through the filter. The larger ones are not dissolved so they stay behind as the used up coffee grounds that get thrown away.

First answer by Natural Val. Last edit by Natural Val. Contributor trust: 2472 [recommend contributor ]. Question popularity: 13 [recommend question].

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