During one of our science rotations today, students got to make their own Water Whistles! Before telling them what materials we would be using, we brainstormed what we thought a water whistle might be made out of. These answers proved to be quite interesting! ("If you put your recess whistle in water and blow, that's probably what a water whistle is..." or "Stick your face into some water and whistle.")
Then we watched this Steve Spangler video via Youtube-click here to view it. It lays out the whole experiment and is super quick (57 seconds). Students cut a straw partially, bend it, and place it in a cup of water. I had a few students whose whistles sounded exactly like a real person's! They loved this, especially the fact that they could try it at home as well!