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I DON'T KNOW HOW THIS WILL WORK I do hope your teacher will let me know how this works. Or if it works. Pour a cup of hot water into a transparent wide-mouthed gallon jar. Probably better to use a glass gallon jar, as opposed to a plastic jar, which may melt. Put a plastic bag in the jar, and fold its edge over the rim, fastening the bag tightly with rubber bands. The brilliant scientist did not elaborate on the size of plastic bag or if it is to be sealed before fastening to the rim of the jar. How hot should the water be? Hold the jar firmly on the table, and let another student pull upwards quickly on the bag. Describe what you see in the jar. When the bag is pulled upward, the pressure in the jar is reduced, and the warm moist air in the jar expands. The air in the jar cools as it expands, and a cloud forms inside the jar. When the bag is released, the cloud disappears. This activity can be repeated several times. The cloud is best seen when the light source is behind the viewer. You should be able to generalize that clouds can form in a similar way. You may have to experiment with different sizes and types of plastic bags and different temperatures of "hot" water. Now, remind your teacher to call me.  Any problems with this page? Send URL to
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