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Huff and Puff Challenge

Puff and puff, but the piece of paper won't go in the bottle. What in the air pressure is happening?

Rating: 54321

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Putting an item into an empty soda bottle is a piece of cake. Just drop the object through the mouth of the bottle, right? Well, we have a challenge for you. Place a small item in the mouth of a bottle and attempt to blow the object into the bottle using a straw. Not so easy, now is it?

Materials
  • Small paper ball
  • 1-liter bottle
  • Drinking straw
  • Various small objects

Videos

  • Huff and Puff Challenge - Sick Science! #140
Print Experiment

Experiment

  1. Create a small paper ball by bunching up a piece of paper. The ball needs to be able to loosely fit inside the mouth of the bottle.
  2. Place the paper ball in the mouth of a 1-liter bottle that has been placed on its side.
  3. Direct a straw towards the mouth of the bottle and attempt to blow the paper ball into the bottle.
  4. The paper ball wiggles and jiggles around before flying out of the bottle!
  5. Replace the paper ball in the mouth of the bottle and try again. The ball just will not go into the bottle.
  6. Try doing the experiment with other objects! Try:
    • Small marshmallow
    • Miniature bow
    • Wedding mint
    • Piece of popcorn
  7. Every item you try comes right back out of the bottle. What's going on here?

How Does It Work?

As you might have guessed, the Huff and Puff Challenge has a lot to do with air pressure and air movement. With an item like the paper ball resting in the mouth of the bottle, it would make sense that the air from the straw would blow it into the bottle, but the exact opposite happens.
 
The secret is inside of the bottle. Although we refer to the bottle as being "empty," it's actually full to the brim. That's impossible… we can't see anything! Well, can you see the air that you breathe? The bottle is filled with air! Trying to blow more air into the bottle is impossible, just like if you were to put your lips directly on the mouth of the bottle and blow. It doesn't work! 
 
While you can't blow air into the bottle, you are moving quite a bit of air along the sides of the bottle. When the air blows past the mouth of the bottle, it creates an area of low pressure behind it. This is called Bernoulli's Principle. This area of low pressure is exactly what the paper ball needs to hop out of the bottle's mouth!

Customer Reviews

Bernoulli Review by Brett Moonen
54321

What a great example. You can do the same by hanging two apples on strings from a horizontal dowel and asking the student which way the apples will move when he blows between them, or for older students ask one why your car is pulled over toward a semi-trainler when passing it on the highway. These and a few others are great science fair interactive displays.

(Posted on April 25, 2013)

Seniors love science too Review by Bobbie
54321

I work at a nursing home and we combined this challenge with the flying tp and ping pong balls- we had a great time! Thanks

(Posted on April 25, 2013)

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