Experiment 2: High or low pressure Supplies: Two ping-pong balls, tape, thread, straw Directions: Cut the thread to create 2 twelve inch pieces. Tape a piece of thread to each ball and then hang them so the balls are side by side. You can also tape them to a door frame. Just be careful to not peel off the paint, especially if you are renting or in the residential halls. Using the straw, blow air as hard as you can between the ping-pong balls. Questions: (1) What did you observe