Lighter than air vacuum?

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Offline Robcat

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Lighter than air vacuum?
« on: 23/07/2015 21:04:55 »
If it was possible to construct a light enough container of some size in which  vacuum could be created,  would it be lighter and if strong enough not to implode, would it float away as if filled with hydrogen of helium ?

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Offline chiralSPO

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Re: Lighter than air vacuum?
« Reply #1 on: 23/07/2015 21:59:49 »
As long as the sum of the mass of the container and the contents are less than the same volume of air, the thing will float.

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Offline evan_au

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Re: Lighter than air vacuum?
« Reply #2 on: 23/07/2015 22:27:26 »
Quote from: Robcat
If it was possible to construct a light enough container ... strong enough not to implode,
That is the problem - Earth's atmospheric pressure at sea level is about 10 tonnes (or tons) per square meter.

Any known material strong enough to resist that immense pressure will be too heavy to float in air (but even iron can float in water!).