Hand picking is a method of separation in which components of a solid-solid mixture can be separated simply by picking a particular component by hands. This method is carried out in dry conditions, i.e., no liquid solvent is needed.
This method is generally used to separate the impurity which needs to be removed from the mixture.
The substance in hand picking can be separated on the basis of colour, size, shape, weight, etc.
The substance in hand picking can be separated on the basis of colour, size, shape, weight, etc.
It is a method which is very commonly used even in our houses. Our mother cleans rice, pulses grains, etc. by this method. But this method is useful only when the mixture to be separated is in small quantity.
Other examples:
1. Separating rotten vegetables from good ones
2. Separating red grams from rice
3. Separating green grapes from black grapes.
1. Separating rotten vegetables from good ones
2. Separating red grams from rice
3. Separating green grapes from black grapes.
Advantages:
1. Less time-consuming
2. Doesn't need any special machine or skill
1. Less time-consuming
2. Doesn't need any special machine or skill
Disadvantages:
1. Possible with only small quantities
2. Components should be distinguishable, i.e., there should be difference in physical appearance of the components.
1. Possible with only small quantities
2. Components should be distinguishable, i.e., there should be difference in physical appearance of the components.
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