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Questions tagged [matter]

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2
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2answers
2k views

Can space exist without matter or energy? [closed]

Is it possible for the space to exist without matter or energy?
1
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2answers
226 views

Dust and radiation equation of state

Does anyone know what is the equation of state, $$ P=w\rho \hspace{5mm} w\in \mathbb{R} $$ for 'dust' and radiation (photon gas)? i.e., I want the number $w$ for both cases. Can $w$ be negative?
-2
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1answer
248 views

Matter waves? what does de Broglie mean? [duplicate]

What is the physical meaning of somethings matter wave? I mean its not like were all vibrations in spacetime, right?
9
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2answers
1k views

What is the physics definition of space?

When astronomers, physicists say that space is expanding, does the definition of space include matter, energy and the particles within? Or is space an empty 'stage' in which all of the above exist? ...
2
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1answer
282 views

Is the expansion of space universal or local?; does matter impede the expansion of space?

Michael Strauss in his recent book "Welcome to the Universe" with authors Tyson & Gott describes that space is NOT expanding within galaxies but rather between galaxies. So then the expansion is ...
5
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2answers
608 views

What energy is $E=mc^2$ talking about?

Everyone knows Einstein’s $E=mc^2$ equation: it is the beautiful relation that links energy with mass. My high school (tenth grade) book says that the equation can be used to find the energy released ...
0
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2answers
158 views

Expansion of spacetime and matter [duplicate]

When space expands, light is said to be stretched or red-shifted. In fact, Penzias and Wilson discovered this in 1965 and were awarded the Nobel prize in Physics for this discovery. Now, what I am ...
0
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1answer
339 views

Can degenerate matter be in the form of a liquid?

This title probably makes no sense, and that's the problem I'm having. As far as I know, degenerate matter is an entirely different phase of matter altogether — it may have fluidic properties, but it'...
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0answers
150 views

Liquification of gas

During the process of liquification of gas the volume of gas suddenly decreases in the region BC. what happens in the gas which causes such an abrupt change in its volume at a constant pressure?
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0answers
26 views

Does the knowledge of a material's atomic structure provide sufficient data to predict its behavior with matter?

What are the properties of a material on an atomic point of view that define its behavior? The whole world around us consists of atoms of varying numbers of electrons, protons and neutrons. Suppose ...
0
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1answer
48 views

Could matter and antimatter have drifted away early after Big Bang?

Early after Big Bang, could small parts of matter and antimatter have drifted away in opposite directions and thus still be able to maintain anti/matter balance, but keep local isolated pockets that ...
0
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1answer
152 views

Can we get infinite antimatter from vacuum?is there infinite antimatter?

By doing this?:... https://www.google.es/amp/phys.org/news/2010-12-theoretical-physics-breakthrough-antimatter-vacuum.amp?client=ms-android-om-lge Would that mean that there is infinite antimatter ...
2
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0answers
71 views

Energy, mass and vacuum relationship [closed]

We know that energy equals mass accelerated to squared lightspeed. We can only observe energy as the effect it has on mass. It is not possible to define Energy on it´s own in space time. All ...
3
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0answers
521 views

Richard Feynman - QED: The Strange Theory of Matter and Light

After reading the book QED: The Strange Theory of Light and Matter, an adaptation of four lectures Richard Feynman gave at the University of Auckland, I gained a greater understanding of QED. I am not ...
31
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3answers
5k views

Is Dark Matter called “Matter” only because of gravity?

As far as my understanding goes, dark matter is nothing but an amount of gravitational force, from yet unresolved/undiscovered source(s), needed to explain some observed attributes of our universe. ...
1
vote
1answer
256 views

how does energy exchange occurs without a matter exchange?

In thermodynamics, we differentiate between an open system( exchanging heat and matter with the surrounding), closed system(exchanging just heat), isolated system(neither both). My question is how is ...
1
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1answer
2k views

Does fire have mass and weight? [duplicate]

What exactly is fire, why isn't it defined by the three states of matter, and does it have mass, weight?
8
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3answers
246 views

Is it possible to reassemble a perfectly cleaved crystalline solid?

This is a purely theoretical question about "perfect" solids under "perfect" conditions. Assume you have a crystalline solid with a perfect crystal lattice (i.e. no defects). Let's imagine a cube of ...
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2answers
1k views

Is wave energy or matter? [closed]

There are many types of waves. I want to ask that how do they behave? are they matter or energy?
0
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2answers
2k views

Matter waves require a medium for propagation [closed]

I have read: Matter waves require a medium to for propagation. Matter waves do not leave the moving particle, i.e. are not emitted. But when a particle is moving with some velocity in ...
1
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2answers
1k views

Is anti-matter a viable source of energy? [closed]

I was wondering whether it is possible to harness energy created by small anti-matter/matter particle annihilations. I known that when they meet, a huge flash of light is produced by high energy gamma-...
2
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2answers
864 views

If it's impossible to create matter then how can a Higgs Boson field give objects mass?

mat·ter ˈmadər/ noun 1. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy. "the ...
0
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2answers
80 views

How one estimated total number of atoms? [closed]

We are still exploring the universe along with the contrary of multi-verse, then how one estimated total no. of atoms? Is it just consideration of matter or also anti matter?
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0answers
108 views

How do trace element abundances show that dark matter exists in both baryonic and non - baryonic forms?

I can't seem to find an answer to this question anywhere, any help would be greatly appreciated. Thanks in advance.
0
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1answer
374 views

Force on matter in inhomogeneous magnetic field (diamagnetism and paramagnetism)

I found on this site a formula (4.101). It describes wich force acts on matter in an inhomogeneous magnetic field. $ F_z = m_z * \frac{\partial B_z (z0)}{\partial z}$ What does the fraction consist ...
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3answers
545 views

Why are phase transitions discrete?

It seems like there is no "in-between" for the phases of matter; it can be "solid" or "liquid", but what about the in-between? Why is there no spectrum of matter between the phases (e.g. a range of ...
-2
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2answers
115 views

Can Light Really be Matter? [closed]

I remember during my early education being taught that light is a form of matter. This has always seemed counter-intuitive to me.
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1answer
45 views

If all matter expanded [closed]

I know this is impossible (?), but what would happen if the electron orbit swelled, the gluons extended, and quarks lost density in relation to the gluons, would that affect the universe as we know it?...
0
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1answer
75 views

Would it matter if baryon asymmetry was the opposite?

If the quantity of matter of antimatter was switched, would it change anything?
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4answers
1k views

Which formula for the de Broglie wavelength of an electron is correct?

So, I have my exams in physics in a week, and upon reviewing I was confused by the explanation of de Broglie wavelength of electrons in my book. Firstly, they stated that the equation was: $\lambda = \...
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3answers
1k views

Why does matter curve space time? [duplicate]

I am under the impression that Einstein never explains in his General Theory of Relativity, why matter curves spacetime; could explanations please be given?
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3answers
159 views

Matter and Antimatter (Hypothetical question) [duplicate]

What will happen if we somehow create an "anti-sodium "element and react it with "hydrogen"(not anti)? I am specific about ANTI-SODIUM and HYDROGEN. Not just plain matter and antimatter.
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0answers
315 views

Does the analogous saying: “matter is essentially 'condensed' energy” have any merit?

Einstein in his derivation of special relativity came upon the equivalence of energy and matter, and given the right circumstances, the relation can go either way - matter can become energy, and ...
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1answer
253 views

How likely I am to meet my antimatter self? [closed]

I read that, when a particle and it's corresponding particle of antimatter meet they annihilate and releases a large amount of energy. I also read that if I met my antimatter self and we Shook hand or ...
2
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2answers
398 views

Is a pion matter or antimatter?

It's made up of one quark and one antiquark. I can't seem to find anything that pays this question any attention? Also, what would be the antiparticle of it?
2
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2answers
237 views

Are there different kinds of antimatter reactions?

Obviously, when matter and antimatter collide, they annihilate. But how exactly and are all reactions the same? For example, what happens when a molecule of hydrogen meets a single pion? Does the ...
-2
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2answers
110 views

Could I create a banana? [closed]

As I understand it, until such time as stars were formed and heavier elements could be created, there was just hydrogen and helium, plus trace amounts of lithium an beryllium. Question: if everything ...
0
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2answers
207 views

Don't rulers expand at the same rate as the universe they measure? [duplicate]

If you placed a giant ruler between the sun and our nearest star for example, wouldn't the divisions on the ruler expand at the same rate as the universe - therefore maintaining a constant distance? ...
1
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1answer
86 views

What would happen if light was converted into matter as it is propogating?

If light is a form of energy and can be converted into matter then does light slow down since no mass full object can reach the speed of light
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2answers
692 views

How does electromagnetic radiations penetrate?

I am reading about the discovery of subatomic structure which includes all these things radioactivity, alpha rays, gamma rays, x rays et cetera. I read that electromagnetic radiations are energy ...
0
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2answers
69 views

Photons can be regarded as particles?

So I've been reading an article and stopped at this sentence : "Likewise, we can take energy (such as particles of light, called photons) and turn it into matter." He gave an example of energy which ...
1
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3answers
2k views

Is the empty space really empty? [duplicate]

I've come across another article in "list verse" which says that the empty space is not actually empty at least for a while. I've tried to find about this, so I googled it .It also quotes a word "...
-1
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1answer
1k views

What state of matter is Lightening? [closed]

I know of solid, liquid and gaseous states of matter but what state of matter is lightning? Is it gas, liquid or solid?
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2answers
472 views

Conversion of energy to matter? [closed]

Now, this answer has sort of been asked before. But I haven't really found the answer that I'm looking for. Exactly what is the mechanism by which energy can be converted into matter? By "mechanism"...
0
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0answers
61 views

Do stress and strain contradict each other?

According to the book Engineering Physics by R.K Gaur and S.L Gupta Strain: Strain is a fractional deformation produced in the body when it is subjected to set of deforming forces. Stress: The ...
2
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2answers
231 views

What happens during mass-energy conversion?

A mass is another form of energy. When a mass ceases to exist as 'matter', it exists as energy - in the forms of energy we generally know (light, heat). But is this so simple? When a mass exists in ...
2
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1answer
59 views

Calculating Dark enegy, dark matter and the rest [duplicate]

I have read that Dark energy composes roughly 68% of the Universe and that Dark matter composes about27% and everything else is less than 5%. Where and how did they come up with these figures?
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0answers
51 views

Can a solid object inside the black hole event horizon avoid the singularity? [duplicate]

I will ask this as a simple lay man. Let's consider an astronomical black hole that was creating by in falling matter on a neutron star. As neutron star get heavier it gets smaller and a Schwarzschild ...
-2
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3answers
924 views

If mass is not conserved but instead energy is conserved, is it right to say that the fundamental particles are photons? [closed]

If mass is not conserved but instead energy is conserved, so is it right to say that the fundamental particle of the Universe is photon instead of protons, neutrons, electrons, leptons, etc and all ...
0
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1answer
53 views

Space is expanding but the space around me isn't [duplicate]

Everyone says space is expanding and distances between galaxies growing. But space isn't limited to outside of the earth. Space is everywhere on earth and around me. However I don't notice any ...