How do you get the air out of a snow globe?

Question:what i'm trying to say is, is there any way i could get the air out of a couple globes i have? just curious. :)

Answers:
Remove the glued in stopper on the bottom or drill a hole in the bottom and add more fluid - use distilled water. Reseal the hole with silicon caulk.
Might try this site to understand the workings behind the globe: http://www.angelfire.com/my/dcs/tutorial...