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    Twin Cities Public Television
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    In this activity about molecular diffusion (located on page 2 of the PDF), learners will make predictions and move molecules of iodine through a seemingly solid plastic sandwich bag. The process of...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Pratt School of Engineering, Duke University
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    Learners design their own experiment to explore the permeability of different materials such as soil, sand, gravel, and marbles. They will also be introduced to the basic concepts of building...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    COSI
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    In this activity (page 11 of the PDF), learners investigate how quickly water moves through various materials. They measure and compare the permeability of gravel, sand, and soil. Although this was...

    $10 - $20 per group Ages 11 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    This is an activity (located on page 3 of the PDF) about diffusion of small molecules across cell membranes. Learners will use gelatin to represent a cell and dye to represent molecules to model...

    $10 - $20 per group Ages 8 - 14 1 to 7 days
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    Oregon Museum of Science and Industry
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    Learners design their own experiment to investigate how pollution diffuses through ground material. This model for leaking underground storage tanks helps learners connect their learning to...

    $1 - $5 per group Ages 11 - 14 30 to 45 minutes