Lights, Camera, (Capillary) Action! #MakerEducation

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Another fun STEM activity from Scientific American.

Have you ever looked closely at water in a drinking glass? You might notice the surface of the water is not completely flat, rather it forms a small lip, called a meniscus, that curls up around the edge of the glass. This occurs because of two forces: adhesion (the attraction between the water molecules and the glass) and cohesion (the attraction of water molecules with one another). Cohesion among water molecules gives rise to surface tension, or the way water’s surface acts like a stretchy “skin.” Surface tension helps prevent raindrops from breaking apart and allows insects such as water striders to walk on water without sinking. It also contributes to the water rising along the edge of the glass: As some water molecules are pulled up because of their attraction to the glass, they pull others on the surface along with them.

Read more.


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