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→ Boiling point: The temperature at which a liquid boils and changes rapidly into a gas at the atmospheric pressure is called its boiling point. → Boiling: The change of a liquid substance into gas on heating is called boiling. → On heating a liquid like water, the kinetic energy of its particles increases as high as in a gas, thus causing the liquid to change to a gas. → Melting point: The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. → Melting: Change of solid state of a substance into liquid is called melting. → On increasing the temperature of solids, the kinetic energy of the particles increases which overcomes the forces of attraction between the particles thereby solid gets converted to a liquid.
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Have high density and and can not be diffused.ĭensity is lower than solids and can diffuse. Neither have definite shape nor definite volume. Kinetic energy between particles is more than that in solids.ĭo not have definite shape but definite volume. → For example, dust moves randomly because the random moving particles of air collide with dust particles.Ĭonstituent particles are very closely packed.Ĭonstituent particles are less closely packed.Ĭonstituent particles are far apart from each other.įorce of attraction between particles is very strong.įorce of attraction between particles is less strong.įorce of attraction between particles is negligible. → The random or zig-zag movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium, is known as Brownian motion. → This also shows that the partices of matter are constantly moving.īrownian motion of particles (By Robert Brown): → The particles of gases (or vapours) produced by burning the incense stick move rapidly in all directions and mix with the moving particles of air in the room