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Matter in Our Surroundings Class 9 Science | States of Matter | Solid | Liquid | Gas | Class 9 science chapter 1 | matter | matter in our surroundings | rigidity | compressibility | fluidity | ncert solutions for class 9 science | ncert solutions | class 9 science | cbse | ncert
Dear Students, in this video we are going to study a very important topic States of Matter of the chapter Matter in Our Surroundings from CBSE Class 9 Science. Hope you find it helpful & interesting. Enjoy Learning!
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States of Matter
Matter can be classified as solid, liquid and gas on the basis of interparticle forces and the arrangement of particles.
These three forms of matter are interconvertible by increasing or decreasing pressure and temperature. For example, ice can be converted from a solid to a liquid by increasing the temperature.
Three States of Matter
The solid-state is one of the fundamental states of matter.
Solids differ from liquids and gases by the characteristic of rigidity.
The molecules of solids are tightly packed because of strong intermolecular forces, they only oscillate about their mean positions.
Whereas, liquids and gases possess the property of fluidity and can easily flow.
Solids can be defined as the state of matter which has a definite shape and volume and has a rigid structure.
The molecules in a liquid are closely packed due to weak intermolecular forces.
These forces are weaker than solids but stronger than of gases.
There is much space in between the molecules of liquids which makes their flowing ability easy.
Liquids can easily acquire the shape of a vessel, and they have a fixed volume.
In this state of matter, the distances between the molecules are large.
The intermolecular forces experienced between them are negligible.
Thus, translatory, rotatory and vibratory motions are observed prominently in gases.
Gases do not have any fixed shape or volume.
All the above-mentioned topics are described in an interactive and efficient manner so that the students could easily understand them.
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