Science

Have you ever seen your mom making chai, or maybe nimbu pani in summer? When we add sugar to water, it seems to disappear, right? This happens because there's empty space between the water particles, and the sugar particles fit right into those gaps. Socho zara — isn't that cool? What do you think would happen if there were no spaces between particles?

❌ Many students believe that particles in solids or very cold substances stop moving completely.

✅ But that's not true! Particles are *always* in motion, even in solids (where they just vibrate in their fixed positions). Lower temperature only reduces their speed, they never completely stop. If particles completely stopped moving, would substances be able to change their state?

Ek kaam karo — grab a transparent glass and some clean water. Now, carefully drop a single drop of ink into it using a dropper and don't stir it at all. Dekho — what do you observe? How did the ink spread throughout the water without you mixing it?

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Dekho — when we go to buy milk from the dairy, we often ask for 'pure milk', right? Or when we talk about 'shudh ghee' at home, we mean it’s unadulterated, free from mixing. But think about it — from a science perspective, is that milk *really* a pure substance? Socho zara — milk has water, fat, proteins, sugars — so many things mixed together! So, pure in science means something completely different, doesn't it? Now, can you think of any other thing at home that looks pure but is actually a mixture?

❌ If something looks uniform or consistent, like milk or a sugar solution, then it's a pure substance.

✅ No, in science, 'pure' means a substance made up of only one type of particle. Milk, even though it looks uniform, is a mixture of water, fat, and proteins. Similarly, a sugar solution is a mixture, not a pure substance, even if it looks perfectly clear.

Ek kaam karo — take a glass of water and mix a spoon of salt in it. You'll see the salt disappear, giving you a clear solution. Now, in another glass of water, try mixing a little atta (flour) or soil. Do you think both mixtures will look the same?

See interactive experiment in app →