So consider this other scenario below:
Now that you’ve made your prediction, let’s visualize the air particles and see what happens:
If we continue pulling up on the plunger, will the bubble keep expanding? The bubble is able to expand because it is made of stretchable plastic. However, at some point, the plastic won’t be able to stretch any further and the bubble will stop expanding. At that point, the air particle density inside of the bubble will become greater than the air particle density around the bubble. That’s okay, but if the difference in air particle density becomes too great, then the bubble will pop (turning the bubble from a closed system to an open one).
Don’t believe me? Try it out for yourself with a real syringe and a real bubble from a piece of bubble wrap. See if you can get the bubble to pop.