WEBVTT - How do vacuums work?

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<v Speaker 1>brain Stuff from how Stuff works dot com where smart happens. Hi,

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<v Speaker 1>I'm Marshall Brain with today's question, what a balloon filled

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<v Speaker 1>with vacuum instead of helium float? At sea level? Air

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<v Speaker 1>weighs about one point to five grams per leader. A

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<v Speaker 1>leader of helium, on the other hand, weighs about point

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<v Speaker 1>one eight grams. If you weigh a one leader bottle

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<v Speaker 1>filled with air and then weigh the same bottle filled

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<v Speaker 1>with helium, it will weigh about one gram less. If

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<v Speaker 1>the bottle itself weighed less than a gram, you couldn't

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<v Speaker 1>weigh it at all because it would float. You would

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<v Speaker 1>have to turn the scale upside down and put it

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<v Speaker 1>above the floating bottle to check its negative weight. Generally,

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<v Speaker 1>a balloon has to be several leaders in size before

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<v Speaker 1>that one gram per lead or weight difference of helium

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<v Speaker 1>versus air is enough to overcome the way to the

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<v Speaker 1>balloon itself and float. If you could somehow fill a

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<v Speaker 1>one leader bottle with a vacuum, it would float even better.

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<v Speaker 1>A perfect vacuum ways zero grams, So a leader of

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<v Speaker 1>perfect vacuum ways zero grams, and that's point one eight

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<v Speaker 1>grams less than a leader of helium. The problem, of course,

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<v Speaker 1>is that building a lightweight container that can hold a

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<v Speaker 1>vacuum is not nearly as easy as building a container

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<v Speaker 1>that can hold helium. The phrase nature of whores of

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<v Speaker 1>vacuum sums it up nicely. If you could figure out

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<v Speaker 1>a way to do it, however, you could be set

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<v Speaker 1>your vacuum balloon would float even better than a helium balloon.

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<v Speaker 1>Now that you don't need to have a perfect vacuum

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<v Speaker 1>for this to work, any air that you take out

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<v Speaker 1>of the container helps a vacuum balloon to float. For

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<v Speaker 1>more on this and thousands of other topics, visit how

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<v Speaker 1>stuff works dot com. Your photos, music and documents are irreplaceable.

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