NewScientist The Last Word - Tag 'vacuum' details

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Activity in a vacuum. In a vacuum, virtual particles are constantly appearing and annihilating, is this also going on inside my vacuum cleaner?
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Asked by This_is_me
on 2010-12-22 12:16:26

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Categories: Domestic Science, Our universe, Technology.

Tags: vacuum, Particle.

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Can you fire a gun in a vacuum?
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Asked by Oneby0ne
on 2010-12-21 16:09:17

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Categories: Domestic Science.

Tags: fire, vacuum, Bullet, Gun.

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Taps, flow rates & gravity

My colleagues and I were discussing what physical changes the flow of water goes through between leaving the tap and hitting the sink. This was noticed by feeling greater pressure when an object is held at the bottom of the stream versus closer to the tap.

Given that the volume of water flowing from the tap is a constant and that the water is subject to acceleration under gravity during it's fall, presumably the water stream is decreasing in diameter to maintain the same flow rate?

Presumably interference with the air would a place an upper limit on the speed at which the stream would remain together but what would this be and what would the upper limit be in a vacuum?

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Asked by tomouse55
on 2010-10-29 15:38:33

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Categories: Domestic Science.

Tags: water, gravity, vacuum, flow.

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Is a beam of full spectrum light observable if passed through a vacuum, without looking directly at it's source?
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Asked by Franz
on 2010-03-26 01:29:35

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Categories: Our universe.

Tags: light, vacuum, observablelight, fullspectrumlight.

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Would a crossbow work in space?
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Asked by gingerswimmer
on 2010-03-23 13:41:11

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Categories: Unanswered.

Tags: Space, vacuum, tension, crossbow.

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Would a crossbow work in space?
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Asked by gingerswimmer
on 2010-03-23 13:35:21

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Categories: Our universe.

Tags: Space, vacuum, tension, crossbow.

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Technology using vacuums?

Basically, would it be possible to base some electrical or other type of machinery or technology on the transfer of different types of energy through a vacuum such as heat through radiation or light?

Is there any technology which uses this at the moment, but with an actual vacuum as compared to fibre optics or something?

Surely to the extent where you wouldn't necessarily have to pump the gas out to create a vacuum surely this would be cheaper than using actual materials?

Anyway just a thought, any answers would be appreciated.

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Asked by alex-eckl
on 2010-02-26 20:34:09

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Categories: Technology.

Tags: technology, energy, vacuum, radiation, energytransfer.

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Is there something in every point of the universe? Matter, energy, quarks, ...? Or are there points that are truly empty?

Sometimes I read in scientific texts that even in a vacuum there is something. I would like to know if there exists true points of "nothingness" in the universe. Or can there potentially pop up matter or energy or quarks or something else in any point in the universe? If one possible fate of the universe is to get cold and more empty, are those empty spots really empty for good?

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Asked by EsaFromFinland
on 2009-12-28 11:00:25

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Categories: Our universe.

Tags: vacuum.

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In outer space, if one were to release an air-filled balloon into the vacuum, would it burst or freeze first?
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Asked by chalz.r
on 2009-11-07 02:12:30

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Categories: Our universe.

Tags: Space, balloon, vacuum.

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Will space ever fill up? We are constantly releasing materials such as gases and sattelites into space, surely it would eventually fill up with them. Even if it won't, if we increased the amount of materials we released into space to an amount that was at a faster rate than the rate that the universe is expanding, would it fill up?
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Asked by handym
on 2009-09-05 13:17:32