# NEW Wind Bag

SKU #WIN-610
Availability: In Stock
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Students will be blown away by your amazing lung power.

Description

Students will be blown away by your amazing lung power. The wind bag is an 8-foot plastic tube, which, with a little practice, can be blown up with one breath. It demonstrates Bernoulli's principle and how air pressure changes help you blow up the bag. Made of durable plastic, this bag can also be used as an air lift. Elevate heavy objects by blowing up wind bags. These bags help explain some amazing, yet difficult-to-teach concepts. Colors may vary.

Lesson Ideas

Our favorite Wind Bag Demonstrations!

Tie off one end of your Wind Bag. Ask students to estimate how many breaths it takes to blow up the 8 foot tube... 15?... 20?... 40? Ask a student to inflate the tube. Count the number of breaths required. Next show your students that, using Bernoulli's Principle, you can inflate the tube with only a single breath!

HERE'S HOW: Have an assistant hold the closed end of your Wind Bag so it extends out horizontally. Hold the other end wide open. Keeping your mouth about 10 inches away from the opening, blow a fast stream of air into the center of the tube for a few seconds. As soon as your tube is full, close it tightly with your hand and twist it tight. With a little practice, you'll be an expert!

Once your Wind Bag is filled, you can tie it closed or deflate it to store until the next use.

HERE'S WHY:
In 1738, Swiss physicist and mathematician, Daniel Bernoulli stated that as the velocity of a fluid (any gas or liquid that flows) increases, the pressure it exerts decreases. Fast moving air has a lower pressure than air that is not moving. The faster the air moves, the lower the pressure. Likewise, the fast stream of air moving from your mouth flowing into the Wind Bag has a lower pressure than the air outside the tube. Air from the room rushes into this low-pressure area within the Wind Bag and helps to fill the Wind Bag.

Firefighters use Bernoulli's Principle to clear smoke by placing exhaust fans back from doorways, leaving a space. This draws more air (and smoke) from the room. Hot Air balloons are filled more quickly using the same technique.

Inflated Wind Bags make great indoor and outdoor games. Make up your own challenges. How far can they be tossed? How long will they stay up?

Wind Bags make great Art, Geometry and Engineering Projects

Wind Bags can be made into sculptures, structures or even moving works of art. Doron Gazit calls it Wind Bag 'architecture'. We call it fun and educational. Just attach two #33 rubber bands together, and slip them over the ends of two Wind Bags to connect them together. Then challenge your students...

Can you build a sculpture that moves in the wind?

Which structure is more stable, a square, a pyramid or a tetrahedron?

How tall a structure can you make?

Wind Bags can also be filled by holding them with the open end wide and running with them. Or, wave them up and down and 'scoop' air into them. Try holding them open and let the wind fill them.

CLASSROOM SAFETY PRECAUTIONS
Please keep Wind Bags, and all plastic bags, away from babies and young children as they are a suffocation hazard. Do not use Wind Bags anywhere small children might gain unsupervised access to them. Wind Bags are not a floatation device.

Demonstrations involving Wind Bags placed between the tops of two tables in order to lift one is dangerous and, in our opinion, should not be attempted in the classroom environment. If one of the Wind Bags should burst or otherwise deflate, the tables can slam together with great force, crushing the fingers of the individuals inflating the tubes. Furthermore, the tubes are round and, once inflated, can act as rollers allowing the top table to slide and crash to the floor unexpectedly.

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### NGSS

This product will support your students' understanding of the Next Generation Science Standards (NGSS)*, as shown in the table below.

 Elementary Middle School High School K-2-ETS1-2 Students can use the Wind Tubes in an investigation to develop a simple sketch, drawing, or physical model to illustrate how the shape of an object helps it function as needed to solve a given problem. K-2-ETS1-3 Students can use the Wind Tubes in an investigation to analyze data from tests of two objects designed to solve the same problem to compare the strengths and weaknesses of how each performs. 2PS1-1 Students can use the Wind Tubes in an investigation to plan and conduct an investigation to describe and classify different kinds of materials by their observable properties. 2-PS1-2 2-PS1-3 Students can use the Wind Tubes in an investigation to make observations to construct an evidence-based account of how an object made of a small set of pieces can be dissembled and made into a new object. MS-ESS2-5 Students can use the Wind Tubes in an investigation to collect data to provide evidence for how the motions and complex interactions of air masses results in changes in weather conditions. MS-ETS1-4 Students can use the Wind Tubes to develop a model to generate data for iterative testing and modifications of a proposed object, tool, or process such that an optimal design can be achieved. HS-ESS2-4 Students can use the Wind Tubes in an investigation to model how variations in the flow of energy into and out of the Earth system result in changes in climate. HS-ETS1-2 Students can use the Wind Tubes to design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems that can be solved through engineering.

Suggested Science Idea(s)

Fantastic for teaching the properties of air, Bernoulli's Principle. It takes as many as 70 breaths of air to fill a Wind Bag or as little as one breath if you use Bernoulli's Principle. The Wind Bag has a lower pressure than the air outside the tube. Air from the room rushes into this low-pressure area within the Wind Bag and helps to fill the Wind Bag.

Challenge students to build with specific parameters Wind Bags are like balloons that don't stretch. They are not elastic. Students can build structures! Rubber bands can be used to attach the wind tubes Which structure is more stable, a square, a pyramid, or a tetrahedron? How tall a structure can you make? Can you build a sculpture that moves in the wind?

Students can use the illustrated instructions as a launching point for over a dozen creative and educational activities.

* NGSS is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of, and do not endorse, this product.

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