Master Chapter 9 Class 6 - Methods of Separation in Everyday Life (Curiosity) with comprehensive NCERT Solutions, Practice Questions, MCQs, Sample Papers, Case Based Questions, and Video lessons.
Start Learning NowWelcome to Chapter 9. Our journey begins with an exciting summer vacation. We join two siblings, Malli and Valli, as they set out on a grand tour of India to visit their relatives. This trip will become an incredible scientific adventure, taking them from the fields of Haryana to the coasts of Puducherry, and from their grandmother's kitchen to the bustling workshops of Shillong.
At every stop, they will encounter a new puzzle. They will find that in our everyday lives, things are almost never pure. The grain from the field is mixed with stones and husk. The tea we drink is mixed with leaves. The seawater is mixed with salt. Even the sawdust on a carpenter's floor is mixed with iron nails.
We live in a world of mixtures—combinations of two or more substances. And, as Malli and Valli will discover, to make these mixtures useful, we must first find clever ways to separate them.
This chapter is a hands-on exploration of these "methods of separation." We will follow Malli and Valli on their Bharat ki Yatra (Tour of India) and, at each stage, become detectives, learning the simple, brilliant, and often ancient techniques that people use to sort the world around them. As the opening shloka from the poet Kabir suggests, this is a wisdom as old as farming itself: just as a soop (a winnowing tray) retains the good grain and lets the worthless husk blow away, a wise person learns to keep what is valuable and let go of what is not.
Before we begin our journey, we must ask a basic question: why do we bother separating things? As we will see, there are two main reasons:
To remove an unwanted or harmful component. This is the most common reason. When Malli and Valli first arrive at their Nani's house in Haryana, they see their relatives busy separating small stones and husk from piles of grain. Their Nani explains that this is done to make the grains "fit for cooking." You would not want to bite down on a stone in your roti!
To separate two different, but useful, components. Sometimes, a mixture contains two or more things that we want. For example, when we churn curd, our goal is to separate the butter (which is useful) from the buttermilk (which is also useful).
With these two goals in mind, let's join Malli and Valli on their trip and discover the toolbox of separation methods we use every day.
Our tour begins in the vast fields of Haryana. Here, in just one place, Malli and Valli will witness the first and most fundamental methods of separation.
Handpicking The first method they see is the most obvious one. Their Mami, Mama, and other community members are sitting with large plates of grain, handpicking out the small stones and husk. This method is simple, direct, and something we all do. When Malli is later served pulao at lunch, he carefully picks out the whole black peppers he doesn't like and sets them aside.
How it works: Handpicking is used when the unwanted particles are visibly different—in size, colour, or shape—and are present in relatively small quantities.
Threshing Out in the fields, they see farmers beating bundles of harvested wheat stalks on a large wooden log. This is threshing.
How it works: This is a method of force. The farmer is beating the stalks to separate the valuable grains from the stalk they grew on. This creates a new mixture: a huge pile of grain mixed with light, flaky husk.
Winnowing This new mixture of grain and husk is too large to be separated by hand. So, their Nana takes them to see the next step. A farmer stands on a raised platform, holding a soop (bamboo tray). He gently shakes the tray, allowing the mixture to fall.
How it works: This method cleverly uses the wind. The heavier grains fall almost straight down, forming a neat pile at the farmer's feet. The lighter husk, however, is caught by the wind and blown away, forming a separate pile. This is winnowing—a brilliant method that separates a mixture based on weight.
Sieving Before they leave, Valli helps her Mami prepare meethi puri for the journey. Mami takes the wheat flour and uses a sieve.
How it works: Sieving is used when the components of a mixture have different sizes. The fine flour particles pass through the tiny holes of the sieve, while the larger, unwanted particles (like bran) get left behind. They see this same principle at construction sites, where large sieves separate fine sand from pebbles.
Next, the children travel to Ahmedabad, where they visit the Sabarmati Ashram and learn about the historic Dandi March (Salt March). This sparks Malli's curiosity: where does salt come from?
Evaporation Their host, Ghanshyam bhai, explains that common salt comes from seawater. But seawater is a solution—the salt is completely dissolved in the water. You cannot handpick it, you cannot sieve it, and you cannot winnow it.
How it works: The method used is evaporation. Seawater is collected in large, shallow pits. The heat from the sun causes the liquid water to slowly turn into water vapour and disappear into the air, leaving the solid salt behind. We use this method to get a solid from a liquid it is dissolved in.
Malli and Valli's journey continues south to Puducherry, to their Dada and Dadi's house. Here, in the kitchen, they discover a new set of challenges involving liquids.
Sedimentation and Decantation Dada is making tea. He explains that if you do not have a strainer, you can use a two-step process.
Sedimentation: First, you let the tea sit undisturbed. The heavier, insoluble tea leaves will slowly settle at the bottom.
Decantation: Then, you can gently pour the clear tea off the top into a cup, leaving the sediment behind. This same method is used to separate muddy water or to wash rice and pulses.
Filtration Of course, decantation is not perfect; a few leaves always escape. A much better method is filtration.
How it works: Filtration is the process of separating an insoluble solid from a liquid by passing the mixture through a filter—a material with tiny holes (or pores). The liquid passes through, but the solid particles are too big and get trapped. A tea strainer is a filter. A piece of cloth is a filter with even smaller pores. A filter paper has pores so fine it can even separate mud from water, leaving clear water (the filtrate) behind.
Churning In Bhopal, the children drink fresh chhach (buttermilk) at a dhaba. They see a painting of a woman using a mathni (churner) to make butter from curd.
How it works: This method is called churning. The rapid, constant motion (agitating) causes the lighter particles of butter (a solid) to clump together and float on top, separating from the heavier liquid (buttermilk).
The final stop is Shillong, Meghalaya. At their Bua's house, a carpenter accidentally drops his iron nails into a pile of sawdust. He starts to handpick them, one by one. But Malli and Valli, having learned so much, have a better idea.
Magnetic Separation They run and get a magnet.
How it works: They pass the magnet over the sawdust. The iron nails (which are magnetic) leap up and stick to the magnet, leaving the sawdust (which is non-magnetic) behind. This is magnetic separation, a powerful method that separates a mixture based on a unique physical property.
This entire journey, from a simple grain of rice to a dissolved grain of salt, has shown us that separation is an art, a science, and a necessary part of our daily lives.
This journey has taught us the individual methods. But what happens when you have a really complicated mixture? Imagine you are given a bucket of wet sand mixed with salt, iron filings, and small pebbles. You cannot just use one method; you would need a combination, a sequence of steps. Which one do you do first? Do you use the magnet before you filter? Do you evaporate before you sieve?
This is where thinking like a scientist truly begins. It is not just about knowing the tools, but about knowing the right order in which to use them. This is the kind of challenge where a guide is most valuable. Teachoo is built for exactly this. We do not just list the methods; we teach you how to think and plan your way through a complex problem. We help you build a flowchart in your mind, guiding you step-by-step, so you can confidently tackle any mixture, no matter how complicated.
To get started on this exciting tour of scientific methods, click on any topic link to begin your exploration.