Windbags - Cool Science Experiment

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How many breaths does it take to inflate an 2 meter (8 ft) 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 one breath! If you don't believe it, try this amazing science activity! Windbags are so light and strong that even the smallest scientist can demonstrate the amazing properties of air!

About Steve Spangler…

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This is Steve Spangler. There are many people monitoring our YouTube account and replying to comments. Glad you enjoy our videos! Thanks for watching!

sickscience

this is how science should be taught in high school by doing it hands on

blancaify

For folks who wonder how it works: streams energy depends on pressure and flow rate, when you have a bag like this you do not need high pressure to fill it, so you can exchange pressure for flow rate, so that the same ammount of energy is transfered. Air stream from his mouths via forces of viscosity moves bigger volume at the expense of pressure. The reason it wouldnt work with a baloon is that baloon needs considerably high pressure.

Joru

Steve did mention an explosion! This was a segment that appeared on the news shortly before we had Weather and Science Day on May 7th this year. You can check out the explosions and what other cool science experiments we did by searching for Largest Physics Lesson - New Guinness World Record here on YouTube!

sickscience

I had the problem with the shower curtain giving me less than have the space to shower in. I solved my problem by taping two neodymium magnets to the tub wall and two corresponding magnets on the shower curtain. Worked like a charm. :)

ReasonFlees

I love all the science experiments you do Steve, I occasionally use them as school projects, so ya, Thank You!!!!

RandomnessChickGirl

No, by blowing into the bag he increased the speed of the air which in turn lowered the air pressure inside the bag, the greater atmospheric pressure outside of the bag then pushed air into it to stabilize the pressure difference. Bernoulli's principle

yunged

So basically, when blowing into the bag whilst away from it, the air is followed through making a vacuum affect?

lukaq

very genuis stuff put to use in fun ways.

CameronForrester

Dude, Im up at 3:30 and I have Finals in the morning....I cant stop watching! >.< I feel ya man.

awh

He just opens the bag so the air volume gets in the bag and he justs blows in it to make it seem like he filled the whole bag in one breath, which he didn't.

Edge