How many breaths does it take to inflate an 8 foot long bag? Fifty, twenty, ten? -- Your students will be amazed when they see the bag can be inflated with just one breath! You can explain that the secret lies in a scientific principle that involves low pressure and fast moving air. -- The Wind Bag[ª] can also be used to learn about other properties of air and makes a great science fair project. -- Bags come four in a package and include an instruction sheet with demonstration ideas.

$7.50

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Bag Wind Coal

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