Today, our lab was as simple as a penny, some H20, and toothpick. We were told to pile water onto the top of the penny, one drop at a time, until the surface tension gave in.
Image of penny with convex bubble on top
We did this twice and then on the third time, we were asked to put as much water on the penny as we could without breaking the convex bubble. Once we had a penny with the largest amount of water that the surface tension could hold. We then tested how strong the bubble was by putting a toothpick sideways on top of the penny. The surface tension was strong enough that when the toothpick was put on top of the bubble, it stayed there unaffected. We learned from this lab, just how strong the supposed "weak" bonds in water actually are, because they were able to not only stay on the penny, but also withhold the toothpick that was set on top.
In spirit of our next cabbage lab, here is a picture of the cabbage merchant from Avatar the Last Airbender with his cabbages:
Look how happy he is!
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