Describe the continuous motion of particles of matter with the help of an activity.



(a) To demonstrate motion of particles in air:

  • Place few lighted incense Sticks in a corner of a room.
  • Move about the room and smell the fragrance of the incense sticks.

The fragrance produced due to burning of incense sticks is due to movement of vapours produced rapidly in all directions.

(b) To demonstrate motion of particles of solid matter:

(i) Drop a crystal of copper sulphate or potassium permanganate into a glass of hot water.

(ii) Do not stir the solution and allow the crystals to settle at the bottom.

(iii) The colour of the solid is seen spreading slowly. This is because the solid particles diffuse in the water.

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