Bernoulli Windbags are a Steve Spangler Science classic. You can amaze everyone by blowing up a Windbag with just one breath.
How many breaths do you think it takes to inflate an 8-foot (2-meter) Windbag? 70 breaths, maybe? Why even try?
With a simple science secret, you can amaze your students and friends by blowing up your Windbag in just one breath. Windbags are so light and strong that even the smallest scientist can demonstrate the amazing properties of air.
How Does It Work?
Tie one end of the bag in a knot and stretch it out on a smooth surface. Blow into the bag with just one breath and your Windbag will inflate. There is so much more to this bag than this one property, so we’ve included an Activity Guide filled with more fun experiments.
What Does It Teach?
Use this air-mazing experience to demonstrate the properties of air molecules and how they move. Teach students about the Bernoulli Effect, a scientific principle that explains why you can blow up the amazing Windbag with only one breath.
Expand your lesson and use this opportunity to discuss how air pressure creates weather systems that move across the continents and how airplanes fly.
Windbags Are Not Balloons
You can blow Windbags up, but they do not share the same elasticity of a regular balloon. That means that Windbags are easier to inflate than regular balloons, opening the door for a ton of creative activities.
Build Geometric Shapes
Hook two rubber bands together by laying the windbags on top of one another. Pull the rubber bands through each other in opposite directions. Use the rubber bands to arrange the tubes in various shapes. Make giant cubes, triangles, pyramids or even giant balloon animals.
Save Your Breath With Bernoulli’s Principle
The One Breath Bernoulli Bag experiment from Steve Spangler Science is a great way to show students how they can use science to do things easily and efficiently.
At first glance, these large, colorful windbags will seem impossible to blow up without an air pump, but when children embark on this exciting experiment, they will quickly see that science allows them to easily inflate the Windbag with minimal effort.
They will experience Bernoulli’s principle firsthand, gaining a better understanding of airflow and how it can be used by humans. This simple experiment can inspire a lifelong love of science and curiosity about the world and how it works.
Each Windbag is 8 feet long by 10 inches wide (2 meters by 25 centimeters). We offer Windbags in different pack sizes:
•Pack of 4 (colors will vary)
•Pack of 32 (colors will vary)
Safety Information
Toll Free: 800-223-9080
Monday – Friday
8:30 am – 5:00 pm (MST)
Steve Spangler Science
Denver Office
7901 Southpark Plaza, Suite 106
Littleton, CO 80120
[email protected]
UV Color-Changing Beads 
0 reviews with a 3-star rating
There are no reviews with a 3-star rating yet