Question

When we blow crumpled ball inside the empty bottle what happens and why?

Answer 1

the crumpled ball will come flying out. By Bernoulli's principle:                
Bernoulli noticed that air has a lower pressure when it's moving more quickly. As you blow into the mouth of the bottle the air is moving fastest - so is at the lowest pressure. Inside the bottle the air is moving more slowly - so a higher pressure. As the pressure is higher inside the bottle than in the mouth this pushes the paper out!