Bernoulli Bag aka Wind Bag

This experiment is explained by the Bernoulli effect. The faster a fluid moves the lower
the
pressure it creates.

Ask a volunteer to come forward to test his lung capacity against the champ "iron lung"
science guy. The volunteer is asked to blow up the 8 foot long Bernoulli wind bag. After
20 or more blows his air is trapped and squeezed to the bottom to measure its
volume. After the air is released, the science guy brings the bag to his mouth and fills it
up with one single large breath. Amazing!

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Watch Video: Bernoulli bag aka Wind Bag Experiment



















Materials
Bernoulli bags can be obtained from science supply stores or you can use about a 8
foot length of bag from a diaper genie.

Process For Bernoulli bag aka Wind Bag Experiment
The "Volunteer" will probably do just as told and hold the bag right against his mouth -
be sure he does! If he does not fall down and hyperventilate, then he will probably give
up after 20 or so long breaths. The eventual champion will need to hold the bag about
six inches from his mouth and blow a stream of air into the bag in order to fill it.

The Science Behind The Bernoulli Bag aka Wind Bag Experiment
This experiment is explained by the Bernoulli effect. The faster a fluid moves the lower
the pressure it creates. When the "volunteer" blows into the bag all he traps is his lung
capacity. By holding the bag away from your mouth by six inches you create a narrow
stream of air which according to Bernoulli is under lower pressure than the air around
it because of its speed. Air from around the opening is under higher pressure than the
air being blown in and so is forced in with that air. With some practice you can fill the
bag with a single breath. Now grab some friends and try the Bernoulli Bag aka Wind
Bag Experiment.
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