Today we did another experiment. We sprinkled pepper on a bowl full of water. Then we put some dishwashing liquid on our finger and held it in the middle of the bowl. Guess what!!! The pepper raced to the edge of the bowl! We thought it was so cool!
We had a thought. We wondered what would happen if we put glitter on the water. Our hypothesis was that it would do the same thing and when we tried it ... it did! It looked prettier too!
We found out that there is a force called surface tension. This force allows the water to bulge on the top. The dishwashing liquid lowers the surface tension which causes the water to spread out and the pepper to move to the edges. Pretty neat!