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Answer: A full balloon has more molecules of air on the inside, than the same volume of air on the outside. In other words, the concentration of air is higher inside of the balloon than outside. Another way to express the concentration of air is air pressure. So the air pressure is higher inside the balloon than outside.

If you could look at the balloon through a microscope, you would see that it has tiny holes.  Over time, some of the air inside the balloon can slowly escape through these tiny holes.  The air will continue escaping through the skin of the balloon until the air pressure is the same on the inside and outside.

Now you know!

We will learn more about concentration later in this lesson.

 
Brain Twister Activity
Try blowing up balloons in class today.  See what they look like when you come back to class tomorrow!

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