How many breaths would it take to blow up an eight-foot long bag? Depending on the size of the person, it may take anywhere from ten to fifty breaths of air. However, with a little practice you will be able to inflate the bag using only one breath.
Ever hear of a thing called Bernoulli's principle, or Bernoulli's effect or theorem? Well, that's what this is all about. Just watch this video to see how to blow a large bag up with one breath.