Evidence for Particles in Matter
Most of the evidence for the existence of particles in matter and their motion comes from the experiments on diffusion (mixing of different substances on their own), and Brownian motion. It is easy to explain 'what happens in several experiments' if we believe that matter is made up of tiny particles which are in motion. But without the concept of particles, things become very difficult to explain. We will now describe some simple experiments like 'dissolving of a solid in a liquid', 'mixing of tw'o gases' and 'movement of pollen grains in water' which can only be explained by assuming that all matter is made up of tiny particles which are constantly moving.
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1. Classification Of Matter As Solids, Liquids And Gases
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9. Effect of 'Heating' and 'Cooling' on a Saturated Solution
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11. 2. Latent Heat of Vaporisation (Liquid to Gas Change)
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12. 1. Solid to Liquid Change : Melting
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13. Why Solids, Liquids and Gases Have Different Properties
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14. 2. Liquid to Gas Change : Boiling (or Vaporisation)
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15. 3. Gas to Liquid Change : Condensation
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16. 2. The Particles of Matter have Spaces Between Them
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22. 1. Latent Heat of Fusion (Solid to Liquid Change)
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26. 1. The Particles of Matter are Very, Very Small
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27. 4. The Particles of Matter Attract Each Other
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28. 3. The Particles of Matter are Constantly Moving
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29. 4. Liquid to Solid Change : Freezing
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30. Characteristics of Particles of Matter
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32. Two More States of Matter : Plasma and Bose-Einstein Condensate
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38. The Common Unit Of Temperature and Si Unit Of Temperatre
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39. To Show That Solids and Liquids Cannot be Compressed but Gases Can be Compressed Easily
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44. To Show that Liquids do not have a Fixed Shape but they have a Fixed Volume
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45. To Show the Presence of Water Vapour in Air
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49. Gases Can be Liquefied by Applying Pressure and Lowering Temperature
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50. To Show that Gases do not have a Fixed Shape or a Fixed Volume
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