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    American Physical Society
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    In this simple demonstration, learners investigate the properties of air pressure. Learners place an index card on top of a glass full of water, then invert the glass. The surface tension of the...

    free Ages 8 - 14 5 to 10 minutes
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    WGBH
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    In this activity, explore chromatography and the various colors that make up the ink in markers. Use this activity to investigate cohesion and adhesion. The online version of this activity is set...

    1 cent - $1 per student Ages 6 - 11 5 to 10 minutes
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    WGBH
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    In this activity, challenge learners to float a paper clip in a cup of water. Learners discover that a paper clip will sink in a cup of water, except when it is placed on a piece of paper towel....

    1 cent - $1 per student Ages 6 - 11 5 to 10 minutes