A student holds two pieces of paper at the top, 10 cm apart. The flat sides of the papers face each other.

What happens when the student uses a straw to blow a stream of air between the papers?

When the student uses a straw to blow a stream of air between the papers, the two pieces of paper come together because the pressure between the two was lowered. This follows the Bernoulli’s Principle. Hope this answers the question. Have a nice day.