Saturday 18 January 2014

Changes around us: The states of matter.

There are so many changes occurring in the world around us. It may be in the Classroom, in your Kitchen, Living room, just about anywhere. But 'Change' can have several, different meanings.

For example, your Dining Table can be shifted from one place to another. You 'change' your clothes after coming back from School. You sometimes 'change' buses on your way to School. You 'change' benches sometimes, when your teachers tell you to do so.
But, these definitions of 'Change' are not very specific. When you knead dough, it 'Changes' shape. When you press a remote button, the T.V Channel changes.

Well, you can define 'change' as a Twelve-year old would- "Something different seems to be happening, which is pretty much unusual". 
You can't write this in the tests, can you?
A change can be of different types:
1. Change in Shape
2. Change in colour
3. Change in State (Solid, liquid, or Gas)
And so much more.

Let's learn about the Difference between the three states of Matter- Solid, Liquid and Gas.
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Every Object is made of really, really tiny units called molecules. They are invisible to the naked eye. Large numbers of molecules group together to form an object. It may be wood, Wax, Water, Plastic, anything. The three states of matter are different from each other, because the molecules that form them are arranged differently.
states of matter
In a Solid, the Molecules are arranged extremely close to each other. They are tightly packed within a limited space. They have a definite shape and Volume. The movement of molecules is restricted, apart from little vibrations, just like when you find it hard to move about in a very crowded room. For example, Wood, Wax, Ice. 

In a liquid, the molecules are close, yet sufficiently spaced to provide limited movement. That's exactly the reason why water flows. A liquid takes up the shape of whatever container it is poured into. It has definite volume, though its shape is not defined.
Examples are: Water, Oil, Mercury.

In a Gas, molecules are distant from one another, which means they can move freely. It is much easier to run in an open ground than in the Classroom, since Benches and students come in your way. The Gas molecules have something called 'Kinetic Energy' which they gain while moving freely and often collide with other gas molecules. A gas has neither definite shape, nor definite volume. This is because, a single gas molecule can wander far, far, away, because of the unlimited space it has for moving around. This property of molecules of a Gas to move farther away from one another is called 'Expansion', from the word 'Expand'. Examples are Steam or Water vapour, Oxygen, Carbon dioxide.

I shall put up a little pop-quiz the next time I post. 
 -Love.



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