This is a very easy project for kids to do and would work well at school or at a science magic party.

Stuff you need

• A plastic bottle
• A sheet of paper

How do I do it?

STEP 1

Tear off a little piece of paper (like a post it note) and crunch it up into a ball so that it fits in the mouth of your bottle!

STEP 2

Hold the bottle sideways and put the crunched up paper ball into the mouth of the bottle, as shown!

STEP 3

Now for the fun part of this experiment! Challenge a friend to blow the piece of paper into the bottle. Try it - the piece of paper will come flying out!

What's going on here?

This happened because of Bernoulli's principle.

Bernoulli realized that air has a lower pressure when it's moving more quickly.

As someone blows 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!

Bonus

Here's a bonus experiment with a surprising result that also use and demonstrates Bernoulli Principle.

Try either or both of these at your next science magic party!