is it possible to create a vacuum balloon?

Question

anonymous · Answer

I dunno, what is a vacuum balloon?

anonymous · Answer

it's a balloon with no air in it

turingtest · Answer

It is often said that there is no such thing as a perfect vacuum. Though this is not technically true, if the balloon has any roundness to it, it certainly is not a vacuum. The best you could do is flatten the balloon completely and seal it off, but even then it would have a little air in it (perhaps just a few molecules). So in that sense the answer is "no".

If you did something like melt the balloon, or seal the inside together perfectly with a glue of some kind, then you might have a balloon with no air in it; but then it is hardly a balloon now, is it?

underhill · Answer

Define "balloon."

anonymous · Answer

yes, maybe the vaccuumness of the ballon is not absolute. but the point is, is it possbile to generate lift using ultra low pressure balloon since it has much smaller air density. the structure of the balloon must be able to withstand the enormous atmospheric pressure, in this case it would be close to 1x10^5Pa ~ 1atm. if it does, then i think we will have a lift. by the way, thx for answering my question :-)