Methods of Separation in Everyday Life-CBSE Full Notes Science Curiosity Class 6 In English-CBSE Notes
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Class 6 Science Curiosity Curiosity Chapter 9 Methods of Separation in Everyday Life CBSE Full Notes
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Methods of Separation in Everyday Life-CBSE Full Notes Science Curiosity Class 6 In English-CBSE Notes
Methods of Separation in Everyday Life
CBSE Full Notes
Chapter 9. Methods of Separation in Everyday Life
Separation of substances is an important part of our daily life. We often come across mixtures that contain useful as well as unwanted materials. Before using these materials, we separate them by suitable methods. Farmers separate grains from husk, cooks remove stones from pulses, tea leaves are separated from tea, butter is obtained from curd, and salt is prepared from seawater. The method of separation depends upon the physical properties of the substances present in the mixture. Understanding these methods helps us perform many daily activities efficiently and safely.
CBSE Full Notes
These notes explain all the important methods of separation described in the NCERT Curiosity textbook. Every method is based on a particular physical property such as size, weight, density, solubility, or magnetic nature. Selecting the correct method helps us separate substances easily and efficiently.
Why Do We Separate Substances?
Separation is carried out mainly for two reasons. First, to remove unwanted or harmful substances from useful materials. Second, to obtain two or more useful substances separately.
Examples
- Removing stones from rice before cooking.
- Separating husk from grains after harvesting.
- Obtaining butter from curd.
- Separating salt from seawater.
- Filtering tea leaves from tea.
Mixture
A mixture is a physical combination of two or more substances. The substances present in a mixture retain their own properties and can usually be separated by physical methods.
Examples
- Rice and stones
- Sand and iron filings
- Salt solution
- Tea leaves and tea
- Oil and water
Handpicking
Handpicking is the simplest method of separation. In this method, unwanted particles are removed manually with the help of fingers. It is useful only when impurities are present in small quantities and can be seen easily.
Suitable for
- Removing stones from rice.
- Removing insects from pulses.
- Removing rotten fruits from healthy fruits.
Advantages
- Simple method.
- Does not require equipment.
- Useful for small quantities.
Threshing
Threshing is the process of separating grains from harvested crop stalks. Traditionally, farmers beat the harvested crop on a hard surface. Today, threshing machines are commonly used to separate grains quickly and efficiently.
Examples
- Wheat
- Paddy
- Barley
Winnowing
Winnowing separates lighter particles from heavier particles using moving air or wind. The mixture is dropped from a height. The lighter husk is blown away while the heavier grains fall straight down.
| Heavier Component | Lighter Component |
|---|---|
| Grains | Husk |
Used by
- Farmers after harvesting crops.
- Homes for cleaning grains.
Sieving
Sieving is used when the components of a mixture differ in particle size. A sieve contains tiny holes that allow smaller particles to pass through while larger particles remain behind.
Applications
- Separating bran from flour.
- Separating sand from pebbles.
- Construction work.
Evaporation
Evaporation is used to separate a dissolved solid from a liquid. When the solution is heated or kept under sunlight, the liquid changes into vapour while the dissolved solid remains behind.
Examples
- Obtaining salt from seawater.
- Preparing crystals from solutions.
Sedimentation
Sedimentation is the process in which heavier insoluble particles settle at the bottom of a liquid when the mixture is left undisturbed.
Examples
- Muddy water.
- Dust particles settling in water.
Decantation
After sedimentation, the clear liquid is carefully poured into another container without disturbing the settled particles. This process is called decantation.
Applications
- Separating muddy water.
- Separating oil from water.
- Washing rice and pulses.
Filtration
Filtration separates insoluble solid particles from liquids using a filter paper, cloth, or strainer. The liquid passing through the filter is called the filtrate, while the solid left behind is called the residue.
Examples
- Filtering tea.
- Purifying muddy water.
- Water purification systems.
| Term | Meaning |
|---|---|
| Filtrate | Liquid passing through the filter. |
| Residue | Solid remaining on the filter. |
Churning
Churning is used to separate butter from curd. Continuous stirring causes butter to separate because it is lighter than the remaining liquid.
Examples
- Butter from curd.
- Cream from milk.
Magnetic Separation
Magnetic separation is used when one component of a mixture is magnetic. A magnet attracts magnetic materials such as iron, while non-magnetic substances remain behind.
Applications
- Separating iron filings from sand.
- Removing iron from scrap.
- Recycling industries.
How to Select the Correct Method?
The correct method depends upon the physical properties of the substances present in the mixture.
| Property | Method |
|---|---|
| Difference in size | Handpicking, Sieving |
| Difference in weight | Winnowing |
| Difference in density | Sedimentation, Decantation |
| Difference in solubility | Filtration, Evaporation |
| Difference in magnetic property | Magnetic Separation |
Importance of Separation Methods
Methods of separation are useful in homes, schools, laboratories, farms, industries, and recycling plants. They improve the quality of food, help obtain pure substances, reduce wastage, protect health, and support environmental conservation.
Remember These Points
Revise the following points before examinations.
- Mixtures are separated by physical methods.
- No single method is suitable for every mixture.
- Choose the method according to the physical properties of substances.
- Handpicking is suitable for visible impurities.
- Threshing separates grains from stalks.
- Winnowing separates lighter husk from heavier grains.
- Sieving separates particles based on size.
- Evaporation separates dissolved solids from liquids.
- Sedimentation is followed by decantation.
- Filtration removes insoluble solids.
- Churning separates butter from curd.
- Magnetic separation removes magnetic substances.
- Methods of separation are used in daily life, agriculture, industries, and environmental protection.
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Methods of Separation in Everyday Life-CBSE Full Notes Science Curiosity Class 6 In English-CBSE Notes
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