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What To Do
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To introduce students to ideas about air, they first need to realize that air is something, and that it takes up space. This first part of the investigation is designed to get them interested in learning more about air. Place some simple objects between yourself and the group (e.g., a chair, an easel, a student desk, etc). Ask the students what lies between you and the group. As they name each item, take it away until it appears that there is "nothing" standing between you and the students. Then ask, "Is there anything else between us?" Some, maybe all, will answer that there is nothing left.
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After the scene is set, introduce your students to the investigation question: "If air is invisible, how can we know it is there?" Tell your students that they will be investigating this question and that at the end of their investigations, they will be able to provide reliable answers. Have your students brainstorm ideas about how this investigation question could be investigated.
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Here are some initial questions that your students can discuss, in pairs, groups and as a whole class:
Have your students report out their ideas and make a list of them. It might also be a good idea to start a list called "Questions we have about air." This list will provide further insights into what your students know, and also what they feel they'd like to know. By the end of the investigation, most of these questions will probably have been answered.
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