• Place a candle in a beaker or widemouthed bottle and light it. Light an incense stick and take it to the mouth of the above bottle (Figure 14.1).
  • Which way does the smoke flow when the incense stick is kept near the edge of the mouth?

when kept near the edge the smoke goes slightly upwards and then spreads in downward direction because the air at the edges of the beaker is cooler.
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beaker will cool down
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