CBSE Class 9 Answered
Solid State |
Liquid State |
Gaseous State |
The space between the particles is very less.
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The space between the particles is slightly more as compared to the solids, but still very less as compared to the gases. The particles of liquid can slip and slide over each other. |
The particles are much farther apart from one another as compared to the solids and liquids. They have a very disorderly arrangement of particles compared to the solids and liquids. |
The force of attraction between the particles is strong. Thus, particles in a solid are closely packed.
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The force of attraction between the particles is strong enough to hold the particles together but not strong enough to hold the particles in a fixed position.
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The force of attraction between the particles is negligible, hence particles of a gas move freely in all the directions. Gases thus can mix or diffuse into other gases. |
The kinetic energy of the particles is very less and so solids have an orderly arrangement of the particles. Therefore, solids have a fixed shape and a fixed volume. |
The kinetic energy of the particles is more than that of the solids. Thus, liquids have a disorderly arrangement of particles compared to solids. |
The particles of a gas have maximum kinetic energy. They move with high speed in all directions and can exert pressure on the walls of its container. |
Solids maintain their shape even when they are subjected to external force i.e. they are rigid. |
Liquids do not have a fixed shape but have a fixed volume. Liquids take up the shape of the container in which they are poured. |
Gases neither have a definite shape nor a definite volume. They fill up the container completely. |
Solids cannot be compressed. |
Liquids cannot be compressed much. The compressibility of liquids is almost negligible. |
Gases can be compressed easily. Example: the LPG cylinders used at home and the CNG cylinders used in vehicles. |
Some solids may change their shape when an external force is applied but when that force is removed they can regain their original shape. This shows that some solids are elastic. |
Liquids show a property called viscosity. More viscous liquids flow more slowly, while less viscous liquids flow easily.
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