Answer:

1.The cylindrical container contains air so as source of heat is placed near its opening the air inside is heated so the molecules of air moves fast and increases its pressure on the wall of the container this may cause bulging on the wall of the container,the smoke goes through the hole and occupy the area.

2.As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter)

Explanation:

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