Have they ever created a container that could contain a vacuum and withstand the pressure differences and be like a balloon and float?

Have they ever created a container that could contain a vacuum and withstand the pressure differences and be like a balloon and float?
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Answer :

Yes, it’s easy enough to make a vacuum container, but no, it will not float, it will be heavier than air. To make it float, you need to fill it with something lighter than air (helium, hydrogen, hot air) to compensate for the weight of the container.
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