SCIENCE CONCEPT: Air is a gas which is a form of matter. Air has weight. STUDENT OBJECTIVE: Students will discover that although air is invisible, it has a measurable weight. OVERVIEW: The students will compare the weight of two balloons: one filled with air, the other empty. PREPARATION TIME: 10 minutes.

LESSON TIME: 20 minutes. TEACHER PREP: Gather materials WORDS TO KNOW: balloon balance inflate deflate

TEACHER TEXT:

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