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Topics/Subjects:
Physical sciences  
Learning Time:
30 to 45 minutes  
Instructional Strategies:
Lab procedures  
Educational Level:
Elementary school  
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This experimental activity is designed to develop an understanding that air has mass. Students conduct an investigation and observe the change in the position of a bar balancing a balloon inflated with air on one end and a uninflated balloon on the... (View More)

This learning activity engages students in measurement of pH in water and soil samples, plants and other natural materials. By mixing different substances, they observe how pH changes, and become familiar with the pH of common household products.... (View More)

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