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Burning Incense

  • A stick of incense
  • A lighter or matches
  • A grown-up to light it for you
  • Procedure: Light the incense stick and let it burn. As long as you don't move the stick, and there's no wind, you'll notice the smoke rising in a straight, narrow plume and then, suddenly, changing into a tangle of smoke.

    Explanation: The hot smoke is more buoyant than the surrounding air. This buoyancy accelerates the smoke upward. You can nicely visualize the laminar and turbulent sections of the flow.

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