Spread of agarbati smoke in Air, Winds And Cyclones – Class 7 Science Experiment

Chapter Name: Air, Winds And Cyclones

Activity Name: Spread of agarbati smoke in Air, Winds And Cyclones

Activity Description:

In this experiment, students will observe the spread of agarbati (incense stick) smoke to understand the behavior of air and how it moves when heated.

Required Items:

  1. Incense stick (agarbati)
  2. Matchstick or lighter

Step by Step Procedure:

  1. Take the incense stick (agarbati) and place it in a suitable holder.
  2. Light the tip of the incense stick using a matchstick or lighter.
  3. Once the incense stick starts producing smoke, carefully observe its movement.

Experiment Observations:

  • Observe the direction in which the smoke moves.
  • Note whether the smoke rises vertically or spreads in a particular direction.


  1. Handle the lit incense stick with caution to avoid any accidents.
  2. Perform the experiment in a well-ventilated area to avoid excessive smoke accumulation.

Lesson Learnt from Experiment:

The observation that the smoke rises vertically indicates that warm air rises. The experiment demonstrates that warm air is less dense than cold air, causing it to ascend. This behavior is due to the expansion of heated air, which occupies more space and becomes less dense.

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