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Cool Spray Cans

The idea for this experiment came from my wife’s camera. She loves taking photos at the beach, but sand keeps finding its way into the camera. I got a can of compressed air to blow the grit away. As I used it, I knew that it would make a great science activity.


Balloon on scales
A plastic, storage bag would not weigh more when it when it was filled with air, but when I blew up this balloon, its weight did increase. Why?