Questions tagged [matter]

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Does matter turning into energy, or vice versa, violate the Law of Conservation?

I'm new to physics. And I have curiously wondering about the relationship between matter and energy. From what I understand, one can create the other, but is it truly creating or just aiding in the ...
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1answer
118 views

Black hole's time effect and matter (or energy) position

Ok, so after I've read a few (around 50 :P ) articles on subject of black holes. There are a few gaps in my understanding of it. Please follow my reasoning, I bet there is a mistake in there, and I ...
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2answers
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There are 3 things not made of matter [closed]

When I'm teaching middle school science and I'm teaching the concept of matter I usually tell them that everything is made of matter except for 3 things. Space-Time, Energy (light, heat, kinetic, ...
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Does stripping electrons from atoms or adding them effect the state of matter in any way?

Does electric charge effect melting, boiling point or sublimation temperature?
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How is it possible to compress matter infinitely like in a black hole?

How can a star that turns into a black hole technically be smaller than a quark? $10^{12}$ atoms $\geq$ 1 quark. That shouldn't work.
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Does electric charge effect boiling point?

Does stripping electrons from atoms or adding them effect the state of matter in any way?
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1answer
63 views

Matter-antimatter reactions

It's widely known that, using famous equation $E=mc^2$, we can estimate energy in nuclear reactions, matter-antimatter reactions (the most powerful in the universe), etc. It's also known that, in the ...
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1answer
22 views

Pressure of (cold matter)

The first pages of Weinberg's Cosmology state that matter, cold matter like dust has zero pressure. I find it very disturbing. Does 'cold matter' also include fluids since hot matter is radiation, ...
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Why does space expansion not expand matter?

I have looked at other questions on this site (e.g. "why does space expansion affect matter") but can't find the answer I am looking for. So here is my question: One often hears talk of space ...
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Incorporating matter effects on active-sterile neutrino oscillation with mathematica

I recently wanted to study the effect of a constant matter potential on a simple 2-flavor active-sterile neutrino oscillation system using Wolfram Mathematica, but I encountered a big problem in the ...
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3answers
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Why doesn't matter pass through other matter if atoms are 99.999% empty space?

The ghostly passage of one body through another is obviously out of the question if the continuum assumption were valid, but we know that at the micro, nano, pico levels (and beyond) this is not even ...
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What proof do we have that dark matter is matter? [duplicate]

The Dark matter page on CERN's official website describes dark matter as if it were regular matter just with some mysterious properties. This was a surprise to me because every time someone mentions ...
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What is the critical volume/mass of non-deuterated water that appears blue to our eyes?

A glass of water appears clear, but a swimming pool appears blue. At some point there must be a switch and I am wondering if anyone knows what that point is (or if its so gradual we can't tell). Does ...
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What happens to matter if it is left undisturbed for a long time? [closed]

What happens to matter if it is left undisturbed for a long time? Since the question isn't clear enough, here's an experiment: If we put some non-radioactive matter in a box and slow the speed of the ...
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1answer
58 views

What if there was no baryon-antibaryon asymmetry in our universe?

We know that the universe goes through different evolutionary phases: radiation, matter and later dark energy epoch. What would happen if there was no baryon-antibaryon asymmetry? How would the ...
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Matter Standing Waves means 0 probability?

de Broglie standing waves are waves that represent the probability of finding an electron somewhere. In an atom, these waves must become standing waves in order to ensure that no destructive ...
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Is every object in the universe really expanding? Even small scale objects like humans? [duplicate]

So I was asked a question by someone that "if everything in the universe is expanding, then the lens we use to look at stellar objects is expanding as well, meaning we shouldn't be able to tell the ...
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How would neutron matter appear to the naked eye?

Neutron matter is matter comprised entirely of neutrons, as it exists in neutron stars. Most optical phenomena encountered in everyday life, such as light reflection and spectral absorption (i.e. ...
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2answers
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If everything is made up of atoms, what is vacuum made up of? [duplicate]

Do empty space in our universe exist or it is all filled with dark matter or some other unknown matter?
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2answers
50 views

Does the wavelenth of matter waves depend upon the kinetic energy of the particle or object?

Do the properties of the waves (wavelength,frequency) emitted by a particle or object depend upon the velocity, or as to say its kinetic energy? Is the De Broglie equation $E = h \nu $ applicable to ...
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1answer
57 views

Could matter be simply spatial geometry, and nothing else? [closed]

As it will become evident by my question, I have no degree in physics or math. Question: could matter be nothing more than the curvature of space? In that case, different atoms and different ...
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4answers
581 views

Are bosons matter?

The title explains the question. Are bosons matter? As I have seen, there are three answers to this question: No, only fermions are matter. Yes, but only those with mass. Yes, all bosons are matter. ...
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2answers
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What happens if matter particle and antimatter particle both carry no charge were to collide elastically?

I read that particle carrying charge is able to interact with photon so that when electron and positron collides they may be converted into pure photons, then what about neutron-antineutron collision? ...
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Neutrino oscillation in earths matter: electron-, proton- and neutron density

I want to incorporate an estimate of a matter effect in atmospheric neutrino oscillations into a model including active and sterile neutrinos. Since neutrinos are not only created in the atmosphere ...
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1answer
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In Bohmian mechanics, how does the particle's position affect where a particle is detected?

In Bohmian mechanics / pilot wave theory / de Broglie–Bohm theory, my understanding is that a particle's trajectory evolves based on its wave function, and that the position that particle is detected ...
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3answers
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Cosmological Inflation: If Photon expands, why not other matter?

I keep repeatedly reading in many Stack Exchange and Quora questions that space of universe expands but particles (matter) don't, see e.g. this Phys.SE post. The reason given is that particles are ...
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Why isn't dark matter just ordinary matter?

There's more gravitational force in our galaxy (and others) than can be explained by counting stars made of ordinary matter. So why not lots of dark planetary systems (i.e., without stars) made of ...
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Clarification on Phase wave derivation in De Broglie's paper

De Broglie's paper refers to his theorem A periodic phenomenon is seen by a stationary observer to exhibit the frequency $ν_1=h^{-1}m_0c^2\sqrt{1-\beta^2}$ that appears constantly in phase ...
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3answers
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What is the meaning of “matter” in physics?

What is the meaning of matter in physics? By defining matter in terms of mass and mass in terms of matter in physics, are we not forming circular definitions? Please give a meaning of "matter" in ...
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1answer
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If atoms are mostly empty space, why doesn't light pass through everything?

Atoms are mostly empty space, and although I now understand why matter doesn't pass through other matter, why don't photons pass through the empty space of the atoms? Is it the same sort of idea as ...
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5answers
123 views

In general relativity, is there a difference between matter-energy and spacetime?

This is the third time I try to formulate a question in a proper format so as to understand what is going on with gravitational waves at a physical level. I am told that a spacetime oscillation and/...
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1answer
70 views

Could six copies of the universe exist only interacting by gravity? [closed]

The ratio of dark matter to matter is roughly in proportions $1:5.4$ This suggests that if there were about 6 Universes placed in the same space that were completely invisible to each other, except ...
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1answer
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contradiction between total photon energy in the universe and early matter antimatter ratio

When looking at the energy count in the Universe, on one hand we are told dark energy 68%, dark matter 27%, regular matter 5%, neutrinos and photons a very small fraction (trace like). https://en....
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If the universe is expanding, then the distance between the atoms must increase, which should result in decrease in density of everything [duplicate]

In the expansion of universe theory, it is already written that the scale of universe is itself expanding, which means the consequence for expansion of universe is not that atoms are growing in size, ...
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1answer
64 views

“Pure” Yang-Mills and the absence of light matter

I am researching various models of Neutral Naturalness which involve the addition of an additional gauge group whose matter content is uncharged under SM color. Many of these theories state that their ...
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0answers
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Can we say there is literally nothing like vacuum [closed]

OK am trying to find out the meaning of vacuum since particle do exist everywhere even where all 'matter' has being removed am certain the definition of vacuum doesn't make sense with particles can ...
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1answer
33 views

When a solid is dissolved in a liquid, is it still a solid, what about individual atoms or molecules in a vacuum? [duplicate]

I am trying to gain a better understanding about states of matter, the last paragraph is the most important one to be answered. ​It is my understanding that when a solid is dissolved into a liquid, ...
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1answer
27 views

What is the minimum amount of matter do I need to call it “bulk” matter?

I had been reading about bulk properties, but was confused what should the minimum amount of matter be for these properties to hold. For eg: Intensive thermodynamic variables will not remain ...
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1answer
48 views

As space expands does the density of matter remain same or increase? [duplicate]

I learned that space is always expanding. Even between sun and earth, it's just gravity is stronger. Imagine space as graph paper and there is a square object that fills it. Space expands, 1x1 cell ...
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1answer
187 views

Solving the Friedmann Equation for a specific universe

Suppose instead of the cosmological constant there is a quantum field with equation state parameter $w = -1/2$. Assume also it is a flat universe with only this quantum field ($Q$) and with non ...
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2answers
158 views

How can 0-dimensional particles or 1-dimensional strings be 3D matter? [closed]

According to the latest information we got String theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings....
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3answers
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Why Neutrino is a ghost particle?

why neutrinos are called ghost particle.why it is not affected by strong magnetic field. why it does not interact with matter. why it does not interact with gravitational field? I am unable to ...
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5answers
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Why are matter fields predominantly fermions?

Apart from the Higgs, all matter is made up of fermions. Is there any obvious reason why that is?
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1answer
63 views

Minimal quantity of substance to reveal its physical state properties

What is minimal quantity of matter required to reveal its physical state properties? I.e. number of particles/atoms when their collection can be considered as liquid, solid, gas or plasma. I am aware ...
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1answer
61 views

Euler-Lagrange equations for electrodynamics: matter vs. gauge field change

I know how to derive Maxwell's equations from a Lagrangian density via the Euler-Lagrange equations, but I'm bothered by one little detail. Variation of the Lagrangian seems only to be done with ...
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1answer
28 views

How quickly is momentum transferred through an object? [duplicate]

If there was a pole, that was a light year long, out in space. (Away from all physical interference.) If we pushed one end of it, would the other end move instantly? And does it's speed depend on ...
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6answers
2k views

Mass without Matter?

My cursory studies of general relativity had introduced me to the concept of how gravity is associated with the warping of spacetime and that the presence of matter in space warps space and this ...
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0answers
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Do hydrogen and anti-helium annihilate one another? [duplicate]

So far I know that electron and positron annihilate each other completely and release energy, how about matter hydrogen atom with 1 proton and 1 electron come into contact with antimatter anti-helium ...
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2answers
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Intuition for why matter dominated expansion is faster than radiation domination?

In a matter dominated universe $a_{\rm mat.}(t)\sim t^{2/3}$, while in a radiation dominated universe, $a(t)_{\rm rad.}\sim t^{1/2}$. Therefore, a matter dominated universe is expanding more quickly, ...