Diffusion in Matter Around Us – Class 9 Science Experiment

Chapter Name: Matter Around Us

Activity Name: Observing the compressibility of different materials in Matter Around Us

Activity Description:

This experiment explores the concept of diffusion by observing the movement of scents from an incense stick and a deodorant spray across a room.

Required Items:

  1. Unlit incense stick
  2. Lighter/matchstick
  3. Deodorant or perfume spray

Step by Step Procedure:

  1. Ask your friend to stand in one corner of the room holding the unlit incense stick.
  2. You go and stand in the opposite corner of the room.
  3. Take note of whether you can smell anything at this point.
  4. Next, ask your friend to light the incense stick using a lighter or matchstick.
  5. Again, observe and see if you can smell anything now.
  6. Now, you take the deodorant or perfume spray and stand in one corner of the room.
  7. Spray a generous amount of the deodorant or perfume in the air.

Experiment Observations:

  1. Before lighting the incense stick, the scent is likely not perceptible or very faint.
  2. After lighting the incense stick, the scent from the smoke becomes noticeable and starts to spread in the air.
  3. When you spray the deodorant or perfume, the scent quickly spreads to fill the room.


  1. Ensure the incense stick is lit and handled safely.
  2. Be cautious while using a lighter or matchstick and keep them away from flammable materials.
  3. If using an incense holder, place it on a stable surface to prevent accidents.
  4. When spraying the perfume or deodorant, avoid direct contact with eyes or sensitive areas.

Lesson Learnt from Experiment:

The experiment demonstrates the concept of diffusion, where particles (in this case, the scent in vapour and smoke form) move from an area of higher concentration to an area of lower concentration until the concentration is uniform throughout the space. Diffusion occurs due to the random movement of particles in gases, which leads them to spread and mix with the surrounding air.

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