EVSSeperation and SubstancesIntroduction and Method of Hand-picking and Sieving

Introduction and Method of Hand-picking and Sieving

Table of Contents

  • Separation methods
  • Hand-picking
  • Sieving
  • Summary
  • Did You Know?
  • What’s Next?

In the first segment of the chapter ‘Separation of Substances’, we will learn about a few

Separation methods.

Which are the different separation methods?

There are several methods that are usually employed to separate substances. The method chosen depends upon what needs to be separated and it is being separated from which substance.

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    The various separation methods are:

    • Handpicking
    • Sieving
    • Threshing
    • Winnowing
    • Sedimentation
    • Decantation
    • Filtration
    • Evaporation
    • Condensation

    What is Handpicking?

    Handpicking is a separation method in which the components of a mixture can be separated by just picking them out by hands. This method is employed to separate solid particles from other solid particles.

    For example, Separating hunks and stones from the rice grains before the rice is cooked.

    Though it is a cumbersome process, it is a very efficient method if done carefully and meticulously.

    What is Sieving?

    A sieving method is a technique used to separate particles of different sizes.

    This process is usually done by passing a suspension of particles through a mesh or screen with a certain size opening. The particles that are able to pass through the mesh are the ones that are smaller in size than the mesh size.

    The particles that are too large to pass through the mesh are the ones that are larger in size than the mesh size.

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