Question

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?

Answer 1

It will upward in direction .

I wnt figure to understand.

Answer 2

Answer:

We observe that, the smoke of the incense stick, held above the candle goes in upward direction. This is because, the air above the candle is hot and lighter. While the air at the edges of the beaker is comparatively cooler, so the smoke goes slightly upwards and then spreads in downward direction.

6) These patterns of flow of smoke reveal that air currents are caused by uneven heating of air.

Answer Image

Explanation:

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