The Leak-proof Bag: We took a plastic bag, filled it with water and then poked a few pencils through it. The students learned that the plastic bag was made out of polyethylene molecules. They discovered that when the pencils were poked through the bag the molecules in the plastic created a seal making the bag leak-proof.
Walking Water- We placed three glasses side by side, filled the two outside glasses with water and food coloring (yellow and blue) and left the middle glass empty. Then, we twisted two paper towels placing one end in the glasses with water and the other end in the empty glass. After about 30 minutes we noticed that the water started to climb the paper towels making its way to the empty middle glass. We learned that this process is called capillary action and is also how flowers and plants move water from the ground up through their stems and into their petals and leaves.
