Page 2 - 3.Lesson Note-SepTech-Evaporation&Centrifugation

5. Magnetic separation:When one substance in the mixture has some
magnetic properties then this method is quite useful. Strong magnets are
commonly used to separate magnetic elements.

6. Evaporation:Evaporation is a process which is used to separate a solid
substance dissolved in liquid. It is based on the fact that liquids vaporize
easily whereas solids do not.

Applications of Evaporation:
• Obtaining salt from see water.
7. Centrifugation:
It is a method of separating the suspended particles of a substance from a liquid in
which the mixture is rotated at high speed in a centrifuge.This method is useful in
case the suspended particles in a liquid are too small too be retained by filter paper.

Principle of Centrifugation:
When a mixture is rotated very fast, the denser particles are forced to go to the
bottom of the centrifuge and the lighter particles stay at the top.
Applications of Centrifugation:

• Used in dairies to separate cream from milk.
• Used in washing machines to squeeze out water from wet clothes.