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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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