Chemistry - Filtration
Filtration is used to separate insoluble  solids from liquids.
During filtration the liquid is passed through a filter with holes that
allow the liquid to pass through but stop the solid particles.
A kitchen sieve is a simple filter. It lets water through but stops large
solid chunks like spaghetti. Paper filters are most often used in the
laboratory - they have much smaller holes than a kitchen sieve.
Filters with different size holes are used for different substances.
Sometimes it is possible to separate different types of solids by choosing
a filter that stops solids with large particles, but allows the smaller
ones to pass through.
Click to see a video of filtration being used in the laboratory.
In this water treatment plant, solid sewerage is removed from water by a
series of mesh filters.
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