how about just a inflated balloon and a larger un-inflated balloon or a trash bag with a drinking straw between them?

you could pinch off the straw to keep the pressurized air in the inflated balloon.

and if it moves when you release the straw because the air is moving into the bigger balloon or trash bag then that should be good enough.

and really cheap.

we all know that if you blow up a balloon it will fly away if you release it.

without actually doing this simple experiment I can already
say that I believe it will move , and quickly.

Edited by paul (03/12/11 06:03 AM)
3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.