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Investigation Question 2:
How can clouds form?
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Preparation
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Teaching and Learning Focus
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In this investigation, your students will begin to develop their concept
of clouds based upon three basic observations:
- Warm air can contain more water vapor than cold air.
- When air loses heat, some of the water in the air turns to liquid.
- As air loses heat, droplets of water collect and become visible on
solid surfaces.
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Materials Needed
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For each student group:
- Large clear glass or plastic jar with lid, without label
- Supply of small ice cubes
- Quart-size zip-closing plastic bag
- Water at room temperature
- Wooden safety matches
- Small flashlight (observations work best if the viewing area is dimly
lit)
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Safety
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Most of this investigation is considered generally safe to do with students.
However, one part of it involves the use of a lit match. YOU need to demonstrate
this step for the students. Review safety precautions with them carefully.
To ensure all students clearly observe this event, conduct a separate
demonstration at each table. You students can participate with each step
except the one involving flame.
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