• The process by which two substances (an insoluble solid and a liquid) are separated by passing the mixture through a filtering device is called filtration.

  • Filtration is commonly used in our homes.
  • For instance, after preparing tea we filter out the tea leaves using a strainer.


Filtration is also Done:

  •  To remove pulp from fresh fruit juice
  •  To separate mixture of salt and sand. (If we add enough water, the salt dissolves in the water but the sand does not)
  • During filtration, the insoluble solid is retained in the filtering device whereas the liquid passes through it.
  • It is important that the particles of the insoluble solid are bigger than the holes in the filtering device.
  • A filter paper is used as a filtering device that has very fine pores in it.