For hours of free science experiment resources


click here!

A safe surf rated website. Web surfing without surprises
Want the latest free experiments?
Sign up below!

Follow FizzicsVC on Twitter

Bookmark and Share


NEW products

Product specials

Search by Type
Alternate Energies
Animal replicas

Archaeology
Biology
Books
Chemistry
Dinosaurs
Electricity
Flight
Force & Movement
Giant Microbes!
Giftware for geeks
High School Science
Light
Magnetism
Mathematics
Measurement
Nature Study
Puppets
Puzzles & Games
Science Kits
Science Parties
Science Toys

Search by Cost
Under $5.00
$5.00 - $9.99
$10.00 - $14.99
$15.00 to $24.99
$25.00 to $49.99
>$50.00

PDF Order Form

Payment Options

Online Paypal Payments Available

MastercardVisaBankcard

Shipping & Handling
Delivery & Returns

Email us

Privacy
Blow them apart!

Instructions

1. Stack 2 pillars of books, and place the rod across the two stacks.

2. Blow the balloons up, tie the balloon ends and attach 1 string to each balloon.

3. Tie the strings to the rod, so that the balloons hang freely from the rod.
Make sure the balloons are the same height.

4. Blow between the balloons, can you blow them apart? Try using a hairdryer! Why cant you do it?

You will need:

- 2 Balloons

- 2 Even length strings

- 1 Rod or stick

- 2 Even stacks of books

The mathematician Bernoulli found that
moving air has less pressure than air that is still.

In your experiment a low pressure area was created between the balloons when you tried to blow them apart. The faster the air moved between the balloons, the lower the air pressure in that space.

The high pressure surrounding the balloons pushed the balloons together.

The curved surface of the balloon also makes the air travel faster, causing even lower pressure as the air rushes around the edge of the balloon. Curved surfaces are used to create low pressure areas on plane wings and even F1 race cars! Another simple demonstration of this can be done with a funnel and ping pong balls or making vortex smoke rings.
Also, check out this engineering article on F1 aerofoil design!
Bernoulli balloons - why dont they blow apart?
Custom Search

Science news stories courtesy of ABC Science Online.
[Click on any headline for the full story].