Kate's Corner: Walking water experiment

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Earlier this week we had a science lesson and now it's time to put that knowledge to the test in an experiment.

All you need is three, clear cups. You'll want to fill two with water and stir in your choice of food coloring. The third one is in the middle but empty. Then fold a paper towel a few times and put one end in the cup with water and the other end in the empty cup.

Then all you have to do is wait and watch.

You'll start to notice the water walking up the paper towel and into the middle, empty glass.

Why does this happen? Well, if you think back to our science experience earlier this week, we talked about capillary motion or action. That is exactly what is happening here.

The water moves along the tiny gaps in the fiber of the paper towel.
Since the adhesive force between the water and the paper towel is stronger than the cohesive forces inside the water itself, the water travels up the towel and defies gravity.