Questions tagged [matter]

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When Matter condensed — the condenser

Did gluons, quarks, and electrons first appear at the same age of the universe or was one first?
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What happens to weight when ice melts? [closed]

A block of ice is weighed in a container. Then, it is left out to melt. Would the weight of the water be greater, less than, or equal to the ice? I know that it has something to do with density and ...
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Can de Broglie Waves have frequency, just because we know de Broglie wavelength formula? [duplicate]

Sub-question if Yes: de Broglie wave is also often called the matter-wave. While we can find the frequency of an Electromagnetic Radiation from its wavelength $(c=\nu\lambda)$. $c$, in this case, is ...
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Does matter exits in quantum realm? [closed]

I have been taught that matter exists but with double split experiment I was shocked to know that the matter doesn't even exits, it's the state we are which we feel as matter but in real scenario we (...
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How the electric charge of 1 electron is distributed over its volume?

Can we say the electric charge density of an electron is distributed uniformly over its spherical volume?
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Infinite distribution of charge vs infinite distribution of matter

From my textbook: General Relativity is the currently most complete theory of Gravitation, and should be used to describe physical systems each time one of the following assumptions does not hold: ...
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1answer
24 views

Change of flavour in strong interactions?

Sorry if this question has been asked already but after researching I have found that quark flavour is not changed in the strong interaction. This confused me because how can a down and anti down ...
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1answer
47 views

Are energy and momentum imposed by purely geometrical properties of spacetime?

If we defined spacetime as a purely geometrical (not physical) structure of the kind that is in general relativity (a 4-dimensional Lorentzian manifold), would it automatically have properties that ...
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1answer
42 views

Reasonable ways to couple matter with metric

In general relativity without matter, the equation of motion of the metric field is described by the Hilbert's action or the Einstein tensor $G$. It's natural to lead to this conclusion once one ...
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Magnetoelectric effect

I am trying to find a concise and clear paper/book/reference in which there is a proof of the fact that any chiral molecule shows magnetoelectric effect. Could someone help please?
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Are all of the objects that composed the Bose-Einstein condensates absolutely can't be distinguished from each other?

Are all of the objects (e.g. photons or bosons) that composed Bose-Einstein condensates (BECs) literally can't be distinguished from each other? It was said several times on the Internet and many ...
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Can mass be defined in purely mathematical or geometrical terms?

Like curvature of a geometrical shape, is there any purely mathematical explanation for what is mass? Or is it absolutely a physical quantity in which case this question has no meaning? I thought that ...
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1answer
24 views

$\mu \rightarrow \infty $ in magnetized cylinder

Please don't see this as a homework question, for I have already solved the problem and all I'm trying to do is understand the results and make a correct interpretation. In a cylinder made out of ...
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2answers
63 views

Why is vapor from boiling pots hot while vapor caused by air is not?

So when we boil water, the resultant vapor (steam) is hot. But when water is evaporated by air or by atomization, the vapor is cool?! Both water's have absorbed energy from the surroundings and thus ...
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What do we know about the features of Dark Matter? [closed]

In 2020, how much information have we got about this matter? I'm just curious.
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44 views

Is the wavelength of matter proportional to momentum or uncertainty thereof?

I am confused about de Broglie waves and their relationship with the uncertainty principle. Both have similar formula and seem to be the same thing with a slight conceptual difference. De Broglie ...
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3answers
86 views

Expansion of space or contracting of matter? [duplicate]

Can the expansion of the Universe effect be explained by contraction of the overall matter instead? That is, all material objects are in fact contracting, due to what the universal space seems (and ...
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1answer
44 views

Is there work done on a mass from matter-antimatter pairs?

Imagine I have a vaccuum at very low temperature and I put a single neutron in, then gamma rays interact to form matter-antimatter pairs within this vaccuum and assume that this happens extremely ...
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2answers
33 views

Radiation originates due to emission by matter but its transport does not require any matter… Expand?

excerpt from text: Radiation originates due to emission by matter and that its subsequent transport does not require the presence of any matter. Can someone expand on this. This is quite mind-blowing
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What would happen if our galaxy and an identical anti-matter galaxy annihilated each other?

What would happen if every bit of matter in our galaxy annihilated with an anti-matter equivalent at the same time? Such as that stars completely annihilated with identical antimatter stars, planets ...
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1answer
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Is it possible for matter to occupy a singularity, which is the point of rupture of space time caused by a black hole?

Also, are singularities caused by blackholes reversible? May one do work to reverse the singularity or black hole? Do blackholes create permanent holes in space time, thereby shrinking space time, or ...
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Mass and Gravitational Force [duplicate]

Why do mass has a tendency to attract other masses and form bigger cluster of mass? What cause gravitational force to exist? Is it so that at one point of time all matter in universe will form ...
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2answers
70 views

What is the simplest, smallest matter in the universe? [closed]

per wiki, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms. what is the simplest, smallest matter ...
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1answer
129 views

Materials intermediate in density between osmium and neutronium [closed]

The densest elements on Earth are metals. Osmium is the most dense. The densest matter in the Universe is Neutronium which is not an element but degenerate matter. If we put Osmium and Neutronium on ...
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1answer
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Matter/energy conversion?

What known physical processes convert matter into energy? What known physical processes convert energy into matter?
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does matter exist? [closed]

i suddenly think this out of nowhere. suppose when we see for example cells at the micro scale, we will see solid objects and space, and when we see these solid objects at the atomic scale, we will ...
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59 views

De-Broglie Wavelength and the Pilot Wave Theory

I researched a lot of questions on De-Broglie waves on this website and discovered a dense fog of confusion amongst everyone. Louis De-Broglie proposed "Matter Waves" and a simple equation describing ...
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1answer
170 views

What has mass but do not take up space?

Loosely speaking matter is anything that has mass and takes up space... so photon has no (rest) mass and I don't know if it takes up space but it already been disqualified due to failing to meet ...
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1answer
127 views

How do photons create matter?

How exactly do photons create matter? I really have a hard time understanding this. I've seen an explanation where they use other, virtual particles to create electron and positrons, but even then, I ...
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Is there any different how we smash antimatter and matter together?

Imagine: Setup A, we smash relativistic electron at a stationery positron. Setup B, we smash electron and positron head on both moving at fraction of speed of light. Setup C, we allow electron to ...
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Does matter turning into energy, or vice versa, violate the Law of Conservation? [duplicate]

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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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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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 stripping electrons from atoms or adding them affect the state of matter in any way?

Does electric charge affect melting, boiling point or sublimation temperature?
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Does electric charge effect boiling point? [duplicate]

Does stripping electrons from atoms or adding them effect the state of matter in any way?
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73 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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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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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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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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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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1answer
140 views

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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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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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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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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1answer
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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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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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