Two pieces of paper
1. Take two pieces of paper and hold them at the top about 4 inches apart.
2. Blow between the two pieces of paper, from the top down.
3. Do the papers go toward each other or away from each other? Surprised?
The reason for this is Bernoulli’s principle. The faster a fluid moves (gas or
liquid), the less pressure that fluid puts on whatever it’s pushing against.
Since the air is moving faster between the papers then outside the papers,
the stronger outside air pressure pushes the paper together.