Two Balloon Surprise

big balloon=more space (less dense)
vs.
little balloon=less space (more dense)

obviously the air would escape from a more dense container to a less dense one to balance out.

I'm not a scientist but I certainly hope this explanation make more sense :)

Small balloon has higher pressure than larger balloon, therefore air is forced into larger balloon. What's hard to understand about that?

It's nothing to do with the balloon itself, and everything to do with internal (not external) pressures. You can observe the same effect with soap bubbles.

Mr. Wizard did explain this on one of his shows many years ago

Here's how I see it: The surface area of a sphere is given by 4(pi)r^2 whereas the volume is given by (4/3)(pi)r^3. Therefore, as the balloon gets bigger, the volume increases FASTER than the surface area by a factor of r. Since the rate at which air enters the balloon is constant, there is more and more room for air, so the density will DECREASE. So the smaller the balloon, the higher the density of air.

Hope this helps!