Empty space Definition and 69 Threads

Does electron beam in empty space generate magnetic fields around them just as with current in conductor. If yes, then is it experimentally proven that two parallel electron beam would attract each other.

What is the physical significance of fundamental law del.E=0 in free space ?

The intention of this question is to get to the heart of the geometrical properties of space-time according to GR, and to focus entirely on what the theory allows, and not so much on what we actually see. I would like to consider a perfect vacuum, in a euclidian infinite void, completely devoid...

I am not sure this question has been asked here before but I am curious about it. From the Modern Physics Course, I learned that we need a nucleus to create an electron and positron pair (with a photon). And the reason is stated as to conserve linear momentum. If this is the case then how the...

A question arose over a simplification I wrote on another subject. My i information say's that matters antimatter pairs are generated in what is known to be very empty space such as the voids within the cosmic web. When I read about this it was considered anomalous but definitely verified. Now...

If a body have heat and floating in space do it loss heat? If it does loss heat and the how? Thanks!

Our Professor said there will be still an electric field in empty space even without charges.Hows that possible.Space-time has a some quantum property that acts like this ?

https://www.sciencedaily.com/releases/2016/11/161130082804.htm Is there any other detection's to back this up?By studying the light emitted from an extraordinarily dense and strongly magnetized neutron star, astronomers may have found the first observational indications of a strange quantum...

Hello, I am in my first class for C++, so I apologize in advance if this question is amateurish. To be clear, this project is already finished, and what I am trying to do already counted points off against me; I am not interested in cheating, I just want to know what the answer to my issue is...

If fields fill all of space, how do they have room to move? Those tile games we had as kids always required one empty space to slide the tile into.

Please post scientific analysys like measurements. I want to see what they measured with measuring devices. I tried searching Google. Couldn't find any good paper on the subject. Only answers that it's empty and that it's not empty. Always contradictions when searching on Google!

If I have a 1 km cube of empty space at a constant temperature of 2.7 K, how much energy do I have? That is, if I know the total volume of space in the universe and I know what the average temperature of that space is, can I computer to total energy of the universe?

If all fundamental particles are zero dimensional, are atoms empty space? And they are zero dimensional, does that mean that we don't exist?

I red about that because of quantum mechanics space cannot be empty. Particles and their anti particles pop into existence, and the next moment they annihilate each other and vanish out of existence. But most particles are not mass less, so this noise of short lived virtual particles; i think...

Hello, I'd like to share with you a core idea of simple thought experiment which I have had on my mind for a while. I'll be happy if you tell me your opinion and what I am missing. Please note, as English is not my first language, the text below may not be written in the best way (I hope you'll...

We often read that atoms are mostly empty space. A common example is given as, if the atom was a big as a football stadium the nucleus would be as big as a tennis ball on the center and nearest electrons circling around at far side of seats or something like that. How does this reconcile with...

Inside a conductor, as opposed to inside an insulator, charges are free to move around and reposition themselves, which causes that, if we wait a long enough time, the electric field inside them will be zero. But in an empty space there's nothing (by definition) that can stop charges from...

Whenever the twin paradox in GR seems to be discussed, it always seems to be done in the presence of a large mass such that the twins can be considered as test particles moving in some metric. I was wondering whether the same problem could be generalised and be proposed in completely empty...

If we were to take a region of space which had nothing in it, no particles, no light, just empty space, would this space contain energy of some sort? Also if space can warp, change, bend etc then can space be made of something? Like a material? If empty space is nothing then how can it bend or...

Learing about matter and what it is composed of, I'm spending a lot of time trying to wrap my brain around the idea that most of our mass is empty space, that the mass of our atoms is calculated and expressed in energy. How is this possible? Are the recreations moving so fast they almost create...

I'm trying to sketch out what empty space is composed of and I'm drawing a blank (pun intended). http://instantrimshot.com/ No, really though, I'm trying to wrap my head around just what exists in this newly-modeled seething foam we used to call "nothing." From what I understand, within the...

If I start with the standard FRW cosmology equations, $${\eqalign{ 3\dot a^2/a^2&=8\pi\rho-3k/a^2\cr 3\ddot a/a&=-4\pi\left(\rho+3P\right),}}$$ and set [/tex]\rho=P=0[/itex] (or $T^{\mu\nu}=0$), I have $${\eqalign{ 3\dot a^2/a^2&=-3k/a^2\cr 3\ddot a/a&=0.}}$$ The second equation gives $$\ddot...

Is there in reality empty space where there is no energy or matter? or has anyone seen or detected it?

Since there are quantum fluctuations popping in and out of existence then there should be an friction in the space though negligible(i know that they disappear in less than planks time but even then there should be a frictional force all round the universe)

Let me preface this by saying I know very little about relativity. Last night a friend and I were discussing a particular scenario that will probably arise when humans begin to be capable of interstellar travel. Say you take off from Earth and accelerate to some velocity and then coast until you...

Ok, so I know that the laws of physics say reaching absolute zero temperature is impossible, but suppose we took a box that was perfectly insulated in completely empy space, and I took all the particles out of it to create a vacuum. Now, since there are no particles in the box, then wouldn't...

Because of the proportionately huge spaces between the wave-particles in the atom, we accept that 99.9% of any object is empty space. If I understand this at all, the 'empty space' to which this refers is nothing, i.e. not a thing. Of course we would like to describe or quantify 'empty...

I know these are ambiguous questions and am probably opening up a complex can of worms. I figure if we know how much of the universe is composed of dark matter and it's effects, we should also have an idea about its mass from its gravitational pull. Also I figure since truelly empty space also...

Suppose I have a metal rod in empty space with a uniform mass distribution. Suppose a force acts perpendicular to the rod at some distance R from the rod's centre of mass over some time Δt. There are no other forces acting on the rod. (1) What type of motion will the rod have over Δt? Will...

I've always heard that atoms are 99.9999996% empty space, now I am wondering is the empty space between the orbiting electrons and the nuclei just empty; a vacuum...?? My question is: What is in the empty space of the atom?(for I doubt it is actually purely empty) What is in the space between...

hi my question is simple: is there empty space with null energy? thx.

I'm reading Spivak's mechanics book and I'm stumped on some of the math in his derivation of an analytic expression for the motion of a rocket in empty space. Let \mathbf{v}(t) be the rockets velocity, let \mathbf{q}(t) be the velocity at which fuel is ejected from the rocket, and let m(t) be...

Dark Energy, Dark Matter, and "Empty Space" I'm new to this forum, and I've looked around but did not find this discussed. Apologies if I missed it. Has anyone in the research of Astrophysics considered the "missing mass" of the Universe to be contained in the structure of space-time itself...

Could the zero-point field energy at each point in empty space be zero because it is canceled by its own negative gravitational self-energy? Inside particles zero-point energy modes that are larger than the particle size are excluded leading to an excess negative gravitational energy inside...

is it possible for electromagnetic field to exist without matter?

The most abundant element in the universe is hydrogen. The hydrogen atom, like all atoms, is composed of a nucleus orbited by a(n) electron(s). The most likely orbit of the electron in a hydrogen atom, according to the Bohr model, is about 5.3 X 10-11 meters. The volume of the hydrogen atom then...

Does empty space move? What are the laws that govern its motion? The big-bang set the universe expanding. But universe did not consist of matter at that time. So, what started expanding! Empty space - I suppose. But do the laws of motion govern the motion of empty space as well? Don't we need...

Please share the information you have about this topic, post only valid articles and research. By "blocks of empty space within the known universe" I mean blocks of space that are free of both matter and light i.e. there is no light or matter within that space;empty and dark. And the known...

If a sun is giving off photons in every direction in space, does that not mean that all of empty space is full of photons? I know photons have no mass but that still means it is not a perfect vacuum right?

There is no such thing as empty space in an atom. String Theory Amendum Another question that bothers me. We are taught that the atom is mostly empty space and I understand Bohr's atom and the concept of quantum. No problem. However, there is a movement in physics that states the "empty...

I've been wondering two things lately. Why did Einstein make the assumption that the Ricci tensor is 0 in empty space. Is there a physical/mathematical reason? I know later he set it equal to another tensor...which leads to all the cosmological constant business, but I'm just curious why he...

As you know 99.9999 % of our world is empty. Does this empty space correspond to Einstein 4D space-time.

Hi, new guy here. I once saw a graph on the development of the energy density of the universe, with the X axis measuring time (I believe it was in billion years or so) while the Y axis meansuring the density. There were three lines in that graph, energy density of empty space, energy...

Hi everyone, first time poster. Considering some of the things discussed here, I apologize if my question sounds simplistic. If this Earth could be compressed so that all the empty space in atoms would disappear how big would this Earth be? My science teacher once told me that it would be...

I've thought about this one a few times in the past and can't wrap my head around it, how can space or rather nothing actually curve to cause the effect of gravity? Is it possible that it just looks like space curves and it's actually caused by something similar to magnetism? Think about...

What is "empty space"? I always hear this term: "empty space." It is synonymous with "vacuum," but I am having trouble understanding either of these two ideas. How can space be "empty?"

At a physics conference on the east coast, feynman says that empty space isn't really empty but empty space make up of tiny elementary particles that have yet to be detected, and he demonstrated that space is not empty using his feynman diagrams. Physicists at the conference rejected feynman's...

Does Empty Space have Mass? Does Empty Space have Energy? from a previous post i learned that energy is everywhere. Even Empty Space. zero point energy. correct? never mind , i found the answers

Can empty space or emptiness conceive a form from which matter arise?

"Empty Space" Just a quick thought you might enjoy. I was reading a book on quantum gravity the other day when I found myself having a lot of trouble grasping the idea of empty space. When you really sit back and take it in, it is so weird only because we never really experience it. Another...