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Educational Level:
Primary elementary  
Topics/Subjects:
Physical sciences  
Learning Time:
10 to 30 minutes  
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In this short demo/activity, a balloon with baking soda in it is stretched over the mouth of a flask or bottle containing vinegar. The balloon is tipped so that the baking soda falls into the vinegar, and the reaction creates carbon dioxide, which... (View More)

This activity is designed to get students to observe that two objects of equal size can appear to be of different sizes when placed at a greater or lesser distance from the observer. This is intended to assist students in visualizing that the sun is... (View More)

Keywords: Visual angle
Audience: Elementary school
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