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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111 binbag artworkWeb.jpg

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.


Read more about air flow on


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