We all heard air filter paper in our daily life, such as auto field, industrial field, etc.. Do you the work principle of air filter paper?
Filter paper has millions of very tiny pores or holes, far too small to be seen by eye. Molecules and the ions of dissolved salts are even smaller than the holes in the paper so they can pass through the filter paper easily. Any particles we can see, like grains of sand, are much larger than the holes in the paper so they cannot pass through like the much smaller molecules and ions. Thus filter paper can separate solids from solutions and liquids.
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