The vacuum of space

[clapstyx]

Hey a couple of questions on my mind here, probably dead simple for most of you.

 

1. Is the vaccum of space of equal "pressure" throughout the universe ?

 

2. What stops the vacuum from sucking our atmosphere away? (under what conditions might it occur?)

 

3. Is there an interplay between black holes and the vacuum of space ? ie does the vacuum "pressure" increase as large volumes of matter compress under black hole gravity levels ?

 

4.If the answer to the third question is true then are gravity (an inward force) and the vacuum of space (outwardly pulling force) counterbalanced to each other ?

 

5. If the answer is that gravity and the vacuum of space are not related What is the opposing force to gravity ?

 

6. If the answer is that yes gravity and the vacuum of space are inter related would that not mean if all matter found its way into a blackhole that the vacuum may become so great as to "explode" it all out again recreating the universe?

 

7. Is it fair to say that the chances are equally likely that Earth is the last remaining place in the Universe to contain life as it is that life exists elsewhere unknown to us, since we know for a certainty that it does at least occur here, but we have no evidence to suggest it occurs or remains anywhere else ?

 

8.Given that we know that symbiotic relationships occur in nature, which elevate the chances of survival of those species present within them, how likely do you an ecosystem collapse might be if certain critical species in the symbiotic matrix become extinct ? (ie thuis impacting on the survival chances of all species remotely influenced in the positive by their presence).

[ryan2006]

It would be good to start studying the kurby vacume cleaner or the filter queen these vacumes are really suppose to pick up the dust especially the cyclonic action ones. Just for a laugh anyway.

 

I don't know what causes vacumes I haven't studied them much it takes energy to make them work. But I believe their is an invisible energy that cause a vacume perhaps the graviton or waves of gravitation. They just photographed a tornado in space so it would seem that gravity waves would create this or perhaps the graviton I do not know.

 

smile,

 

Ryan

[TheFaithfulStone]

1. Maybe, maybe not. Lambda say yes, quintessence say no. Personally, lean toward no. The vaccuum pressure is not constant. But that's just my sense of aesthetics.

 

2. Gravity. The gravity of the earth. (But there is a heck of a lot more vacuum than there is earth!) (At close distance to a huge mass (like earth) gravity can overcome the pressure equilibirum thing.) But gravity is week, so even something the size of earth can only hold a few miles of air close to it.

 

3. Maybe, put probably not. See George Chaplains Dark Energy Star paper for a marginally convincing explanation of why yes. edit: Wait, wait, wait. NO. Definitely not, I misunderstood what you were asking. The condensation of matter has the opposite effect of it's removal! Matter is positive pressure, vaccuum enery, or quintessence or whatever is negavitve pressure.

 

4. No - because you've misunderstood what negative pressure would entail. It doesn't "pull" it "pushes" say you had an earth size region of negative pressure - if you could force air into it with a rocket our something, it would eventually fall "up" and out of the nega-earth. See the Casimir Effect.

 

5. Maybe quintessence, maybe dark energy, maybe an evenly distributed expansive force of space itself. Unknown at this time.

 

6. :lol: I don't know...

 

7. No. That's a statistical trick. I can just as easily prove that every solar system that meets minium criteria contains at least some life. How? 100% of all solar systems observed with rocky planets in the habitable zone have an intelligent civilization on them. (That is, ours.) Space vacuum how?

 

8.Bloody unlikely. Animals go extinct all the time. Their extinction occasionally drags others down with them but Earth (and life in general) is a pretty tough mother. (Like Shaft? Exactly like Shaft.) Remember, it got hit with a BIG asteroid 65 Million years ago, and here we are. The chances that the extinction of a single species would spell doom for the whole of life on earth? Slim to none. The chances that a particular species of bald monkey wouldn't make it? Well, WE are in a bit of danger. What does this have to do with space vacuum again?

 

TFS

[InfiniteNow]

Sorry... I was getting frustrated scrolling up and down... reposted here.

1. Is the vaccum of space of equal "pressure" throughout the universe ?

1. Maybe, maybe not. Lambda say yes, quintessence say no. Personally, lean toward no. The vaccuum pressure is not constant. But that's just my sense of aesthetics.

2. What stops the vacuum from sucking our atmosphere away? (under what conditions might it occur?)

2. Gravity. The gravity of the earth. (But there is a heck of a lot more vacuum than there is earth!) (At close distance to a huge mass (like earth) gravity can overcome the pressure equilibirum thing.) But gravity is week, so even something the size of earth can only hold a few miles of air close to it.

3. Is there an interplay between black holes and the vacuum of space ? ie does the vacuum "pressure" increase as large volumes of matter compress under black hole gravity levels ?

3. Maybe, put probably not. See George Chaplains Dark Energy Star paper for a marginally convincing explanation of why yes. edit: Wait, wait, wait. NO. Definitely not, I misunderstood what you were asking. The condensation of matter has the opposite effect of it's removal! Matter is positive pressure, vaccuum enery, or quintessence or whatever is negavitve pressure.

4.If the answer to the third question is true then are gravity (an inward force) and the vacuum of space (outwardly pulling force) counterbalanced to each other ?

4. No - because you've misunderstood what negative pressure would entail. It doesn't "pull" it "pushes" say you had an earth size region of negative pressure - if you could force air into it with a rocket our something, it would eventually fall "up" and out of the nega-earth. See the Casimir Effect.

5. If the answer is that gravity and the vacuum of space are not related What is the opposing force to gravity ?

5. Maybe quintessence, maybe dark energy, maybe an evenly distributed expansive force of space itself. Unknown at this time.

6. If the answer is that yes gravity and the vacuum of space are inter related would that not mean if all matter found its way into a blackhole that the vacuum may become so great as to "explode" it all out again recreating the universe?

6. :lol: I don't know...

7. Is it fair to say that the chances are equally likely that Earth is the last remaining place in the Universe to contain life as it is that life exists elsewhere unknown to us, since we know for a certainty that it does at least occur here, but we have no evidence to suggest it occurs or remains anywhere else ?

7. No. That's a statistical trick. I can just as easily prove that every solar system that meets minium criteria contains at least some life. How? 100% of all solar systems observed with rocky planets in the habitable zone have an intelligent civilization on them. (That is, ours.) Space vacuum how?

8.Given that we know that symbiotic relationships occur in nature, which elevate the chances of survival of those species present within them, how likely do you an ecosystem collapse might be if certain critical species in the symbiotic matrix become extinct ? (ie thuis impacting on the survival chances of all species remotely influenced in the positive by their presence).

8.Bloody unlikely. Animals go extinct all the time. Their extinction occasionally drags others down with them but Earth (and life in general) is a pretty tough mother. (Like Shaft? Exactly like Shaft.) Remember, it got hit with a BIG asteroid 65 Million years ago, and here we are. The chances that the extinction of a single species would spell doom for the whole of life on earth? Slim to none. The chances that a particular species of bald monkey wouldn't make it? Well, WE are in a bit of danger. What does this have to do with space vacuum again?

 

TFS

[sergey500]

I don't claim to be on expert on this, but I will try and answer them regardless.

 

1. Is the vaccum of space of equal "pressure" throughout the universe ?

I doubt it. Like time is not constant all through the universe so the same might be true for pressure. I would assume the closer you get to gravity source the larger the pressure becomes. I am not sure.

 

2. What stops the vacuum from sucking our atmosphere away? (under what conditions might it occur?)

Gravity and equality. Our gravity keeps everything on Earth to Earth, so the atmosphere isn't going anywhere because of the vacuum of space. But it depends on size, Earth is huge, it is INSIDE the vacuum. If you're thinking of suction like in movies when things get plunged out into space because of vacuum space, it only because there is large unbalance between the air inside and outside and small enough space accelerates the movement...I think. So Earth is just too big to be sucked anywhere.

 

3. Is there an interplay between black holes and the vacuum of space ? ie does the vacuum "pressure" increase as large volumes of matter compress under black hole gravity levels ?

See answer to one, it probably will because of the immense gravity. But I have no proof the pressure and gravity are coherent.

 

4.If the answer to the third question is true then are gravity (an inward force) and the vacuum of space (outwardly pulling force) counterbalanced to each other ?

Huh? What do you mean? No, not in a black hole. A black holes gravity is much stronger than the power of vacuum, but like for reason of question 2, the black hole is too big to be sucked anywhere. Or balanced out.

 

5. If the answer is that gravity and the vacuum of space are not related What is the opposing force to gravity ?

There is none. For the limit of gravity and other interfearing (I know my spelling horribly off today) gravity gets in the way, that all that I can think off to oppose it.

 

6. If the answer is that yes gravity and the vacuum of space are inter related would that not mean if all matter found its way into a blackhole that the vacuum may become so great as to "explode" it all out again recreating the universe?

Vacuum of space, or as I tried to define in my post What IS space? So I just left the answer as uniformed energy (thats what I think fill space, but there is more details to my idea, I will get ot it later) so no it wouldn't explode, I will think about later, but I am sure it won't. Also its hard to understand you're questions, besides they are all based on assumptions.

 

7. Is it fair to say that the chances are equally likely that Earth is the last remaining place in the Universe to contain life as it is that life exists elsewhere unknown to us, since we know for a certainty that it does at least occur here, but we have no evidence to suggest it occurs or remains anywhere else ?

What does that have to do with your vacuum/gravity idea? No we are not alone, there is plenty of life yet to be found. Patience is a virtue.

 

8.Given that we know that symbiotic relationships occur in nature, which elevate the chances of survival of those species present within them, how likely do you an ecosystem collapse might be if certain critical species in the symbiotic matrix become extinct ? (ie thuis impacting on the survival chances of all species remotely influenced in the positive by their presence).

Say what? Extremely of course. Food cycle might ring a bell. If something critical is gone it will effect the food chain and animals will die or over populate.

[fluid]

1. Is the vaccum of space of equal "pressure" throughout the universe ?

 

Well in my view it should be, because think about it. What creates the vacum? Emptyness, there are no air particles, so the pressure or particles are trying to equally distribute amoung the empty space, therefore creating this vacum. So how can the "pressure" of the vacum change? If the vacum is created by empty space...then the pressure of space should be equal, not countiing any type of atmophere.

 

Hope im making sense here

[Qfwfq]

On which grounds do you suppose the emptiness to be the same everywhere? For one, space here isn't as empty as space out there!!!!! :steering:

 

Earth's gravity confines the atmosphere, pressure on Mars is a lot lower, pressure around the moon is barely greater than elsewhere in the solar system, there would be slightly more pressure in and around a galaxy than between them...

[Lsos]

Exactly. If by vacuum you mean "emptiness", or nothing, then yes, throughout the universe where there's nothing there's...well, nothing. However, there's always something. Even in "empty" space we'll find a particle here or there. Maybe every meter, maybe every mile. Closer to earth, you'll find many more. Hell even between atoms there's "empty" space. I suppose you could ask if that empty space equally distributed...but how do you really answer that question?

[Tim_Lou]

:) how would one define "vaccum pressure"? mathematically?

 

and by vaccum, does it imply there is no force field presented?

 

well, radiation does have pressure...

 

and if you look at pressure similarly to water potential, then there is a "negative pressure" for vaccum but only if it is relative to something "non-vacuum". otherwise i fail to understand the concepts of "vaccum pressure"....

[TheFaithfulStone]

My understanding of this is that theoretically the ZPE should create a "pressure" on the vacuum.

 

This is not "air pressure" but rather the deformation caused by mass.

 

If you could "suppress" the ZPE you would have an area of negative pressure. Like a Casimir Vacuum.

 

TFS

[FrankM]

The vacuum of space is a curious place, just like the term "free space". Just where is "free space" and is it the same place one would find the "vacuum of space"? Scientist claim that "free space" is the same as a vacuum on the Earth's surface, and the measured value of permittivity reflects that of "free space". You will often see the term "permittivity of free space", even though permittivity has never been measured any place except on the Earth's surface.

 

There is a discussion on the meaning of "free space" entered in Wikipedia, but it doesn't define where it is relative to anything.

 

http://en.wikipedia.org/wiki/Free_space

 

To make sure we know exactly what they are trying to define they introduce the term 'vacuum of outer space', whereever that is. Scientists now know that there are a lot of particles within the influence of the Sun's heliosphere and their density varies with distance from the Sun. How can we rationally assume that the "vacuum of space" or that of "free space" is the same within various distances within what is called the Sun's heliosphere as it is 10,000 au from the Sun, or at a point somewhere between two galaxies?

[sebbysteiny]

Vacuum pressure

 

Am I the only one to think that the whole concept of 'vacuum pressure' is a red herring.

 

The pressure in a vacuum is zero, to all intents and purposes.

 

True, you will get a few extra particles here and there, but nothing measurable especially when you are comparing it to an actual atmosphere either on Earth or on any planet or moon.

 

So how can nothing do something to the atmosphere of a planet??? It can't.

 

The whole concept of a vacuum 'sucking' is wrong. What actually happens in, say, a straw, is that the pressure in the air becomes greater than the pressure in the straw so it pushes fluid into the straw. It's the atmostphere pushing, not the straw sucking.

 

So I reckon the answer is, with no other influence on the atmosphere other than gravity, gravity holds the atmosphere on Earth the same way as it holds us on Earth.

 

Black holes

The vacuum is just empty space and time. At the event horizon of a black hole, there is a singluarity in space and time. This means, that space and time breaks down in a black hole and therefore so does the vacuum.

 

But is a vacuum really totally empty?

I'll leave that one for somebody else. Wouldn't want to make it too easy :eek_big:

[ronthepon]

It's absolute conceptual vacuum you must be talking about, because the vacuum outside earth has a finite pressure of about [math] 10^{-20} [/math] Pa.