Marvin and Milo
Explore physics the exciting way, by trying out a simple and fun experiment. This month, Blowing Bags Don't forget to check back next month for the next edition...
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What you need
Plastic bin bag
Hold the bin bag about 5 cm away from your mouth. Make sure it's not any closer!
With your thumb and forefinger create a circle to place the entrance to the bag on.
Gently blow into the bag. The bag will inflate quickly!
Results & explanation
When you blow directly into the bag, the only air flowing into the bag is from your lungs. When you blow from a short distance away you create an air flow that also takes in the surrounding air, which is used to inflate the bag.
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