Physics

Sound


Diffusion in Liquids


Diffusion in liquids is slower than that in gases. This is because the particles in liquids move slowly as compared to the particles in gases. Here are some examples of diffusion in liquids.
(i) If a crystal of potassium permanganate is placed at the bottom of water in a beaker, then the purple colour of potassium permanganate spreads into the whole water, slowly. The spreading of purple colour of potassium permanganate into water, on its own, is due to the diffusion of potassium permanaganate particles into water.
(ii) If a crystal of copper sulphate is placed at the bottom of water in a beaker, then the blue colour of copper sulphate spreads into the whole water, slowly. The spreading of blue colour of copper sulphate into water, on its own, is due to the diffusion of copper sulphate particles into water.
(iii) If a drop of ink is put into a beaker of water, then the colour of ink spreads into the whole water of the beaker.The spreading of ink in water, on its own, is due to the diffusion of ink particles into water.
The gases like carbon dioxide and oxygen are essential for the survival of aquatic plants and animals. The carbon dioxide gas and oxygen gas present in air (or atmosphere) diffuse into water (of ponds,lakes, rivers and sea), and dissolve in it. The aquatic plants use the dissolved carbon dioxide for preparing food by photosynthesis and aquatic animals use the dissolved oxygen of water for breathing. This is an example of diffusion of gases into a liquid. In fact, solids, liquids as well as gases can diffuse into liquids. The rate of diffusion in liquids is much faster than that in solids because the particles in a liquid move much more freely, and have greater spaces between them as compared to particles in the solids. Temp, on Celsius scale + 273
And,Temp, on Celsius scale = 300 - 273= 27°C
Thus, a temperature of 300 K on Kelvin scale is equal to 27°C on Celsius scale.
It is clear from the above discussion that:
(i) To convert a temperature on Celsius scale to the Kelvin scale, we have to add 273 to the Celsius temperature.
(ii) And to convert a temperature on Kelvin scale to the Celsius scale, we have to subtract 273 from the Kelvin temperature.

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Notes


Sound - Notes
1. 3. Humidity of Air
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2. 2. Liquid to Gas Change : Boiling (or Vaporisation)
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3. 4. Wind Speed
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4. Effect of 'Heating' and 'Cooling' on a Saturated Solution
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5. 2. Latent Heat of Vaporisation (Liquid to Gas Change)
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6. 2. Surface Area of the Liquid
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7. Classification Of Matter As Solids, Liquids And Gases
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8. Matter is made of particles
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9. Properties of Liquids
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10. Why Solids, Liquids and Gases Have Different Properties
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11. 2. The Particles of Matter have Spaces Between Them
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12. Liquids
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13. Properties of Solids
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14. Sound - Study Points
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15. 1. Solid to Liquid Change : Melting
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16. 3. Gas to Liquid Change : Condensation
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17. Evaporation
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18. 1. Latent Heat of Fusion (Solid to Liquid Change)
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19. 1. Temperature
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20. Diffusion in Liquids
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21. Effect of Change of Temperture
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22. Latent heat
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23. 1. The Particles of Matter are Very, Very Small
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24. Gases
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25. 4. The Particles of Matter Attract Each Other
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26. Change of State of matter
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27. Effect of Change pressure
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28. 3. The Particles of Matter are Constantly Moving
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29. Characteristics of Particles of Matter
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30. 4. Liquid to Solid Change : Freezing
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31. Two More States of Matter : Plasma and Bose-Einstein Condensate
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32. Factors Affecting Evaporation
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33. Diffusion
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34. Cooling Caused by Evaporation
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35. Solids
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36. Dissolving a Solid in a Liquid
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37. Matter In Our Surroundings
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38. The Common Unit Of Temperature and Si Unit Of Temperatre
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39. Mixing of Two Gases
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40. To Show That Solids and Liquids Cannot be Compressed but Gases Can be Compressed Easily
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41. Evidence for Particles in Matter
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42. Sublimation
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43. Rigid and Fluid
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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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46. Movement of Pollen Grains in Water
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47. Diffusion in Solids
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48. Gases Can be Liquefied by Applying Pressure and Lowering Temperature
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49. Diffusion in Gases
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50. To Show that Gases do not have a Fixed Shape or a Fixed Volume
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