A bottle filled with air...
Now let the bottle and the attached balloon cool down again so the balloon returns to its previous deflated state (see picture below).
What will happen to the balloon if you put the bottle with it for about 1 hour in the fidge?
Prove your assumption with an experimen, then hit the right answer.
a) nothing happens!
b) the balloon inflates again just like when the bottle was heated
c) the balloon gets pushed into the bottle and inflates inside it.