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yes, I think that is usually compressed air. I wou thought that I might be able to do the same thing with water, but in order to have enough pressure to fill a balloon could be hard. The balloon would not need to be standing straighgt up, I could put the thingey you put the balloon on facing down, but it would be good if it could be standing up. It is a clown like the normal ones, but it is painted on to a piece of plywood. Thanks for the comment and the link.