what does the term 'particle' mean in physis?

Answer 1

As was said before, my favourite explanation is this:

A body whose spatial extent and internal motion and structure, if any, are irrelevant in a specific problem.

This is why, for certain problems, dust 'particles' can be considered (for brownian motion experiments, for example). In other cases (like cathode-ray tubes) a negative beam of particles is launched (these are electrons). In experiments of neutron diffraction, neutrons can be considered to be particles because their interaction with matter is always the same. The internal structure of the neutron gives it a magnetic moment, but as all neutrons posess the same internal structure they can be considered as particles.

Water molecules can be considered particles when in liquid (and gaseous) state because their internal structure has no effect on their behaviour. When water freezes, the isotope of hydrogen (and oxygen, to a lesser extent) drastically alters how the ice crystals form. For this reason, water molecules in a freezing experiment can't be considered particles.

Answer 2

It means the same thing it means in English. Check this out:

"NOUN:

1. A very small piece or part; a tiny portion or speck.
2. A very small or the smallest possible amount, trace, or degree: not a particle of doubt.

Physics
A body whose spatial extent and internal motion and structure, if any, are irrelevant in a specific problem.
An elementary particle.
A subatomic particle. See Table at subatomic particle. " [See source.]

If you use the commonplace and most widely known definitions (1. and 2. above), even in the physics context, you will do just fine. Using arcane definitions little known outside a special context makes no sense if the intent is to communicate with as many people as you can.

One of the barriers to understanding physics and the other bodies of knowledge is that the people working in these domains invent definitions...and they usually do it very poorly. They are not lexicographers and many of them have no clue what a good definition entails. [See second source.]

Before ending this, please note the dictionary so-called particle definitions above. In two of the three instances, it uses the word "particle" do define the word particle. Look at those; how can one expect to gain insight on what particle means when they actually use the word they are defining in the definition. That's like saying "a dog is a dog" for the definition of dog. Stick with the commonplace definitions and you will find communicating much more effective because people will actually understand you.

Answer 3

A particle is a substructural division of mass . The components of the atoms are the basic masses which intergrate a structure of atoms and make up the composition of many materials. The components of the atoms are called elementary mass structures ,they are Neutrons ,Protons and Electrons. What comes out of the atoms as radiation are basically particles. These particles are being described as carrying anergy. So any minute structure which carry energy are called particles. A particle has its own indentity and particle motion is oscilliatory.
A particle to be a component of mass needs be containing a volume and a density
The structure of space is basically a particle structure. So the substance of space according to Quantron Theory must also be composed of a seed like structure. Since it would be the basic non structured mass of the Universe it can only be identified as a space power lump. Hence We have no way of isolating it.
Einstein must have been aware of this Aether space structure and today it is called dark matter and energy..He described it as the cosmological constant in his General relativity Field equation. If we cannot weight a particle, Physics describes such a particle Massless.

Answer 4

It mean subatomic particles like protons, neutrons and electrons. Basically anything smaller than an atom.

Answer 5

when the energy is concentrated in a point