Author Options:

what is anything that occupies in space and has mass? give the meaning of 4th state? Answered

one word, 6 letters. The 1st letter is M, and the last letter is
give the meaning and who discover the 4th
state of m____r.


it is the best answer
plasma is a highly ionized gas that occurs at highly temperature.
the scientist who discover the plasma is
sir william crooke


Best Answer 7 years ago

Plasma, a substance similar to a gas with a portion of the particles ionized
Sir William Crooke

Awwww. You shouldn't be answering people's homework problems for them.

Has term started somewhere (next week for me)?

I just thought is was a crossword.

Here in California, a lot of districts started this past Monday.

But remember, "It's always September on the 'Net."


a plasma is an ionized gas, a gas into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species, ions and electrons, to coexist

good luck to answer my question.

Good luck on your homework problem. Next time, pay attention in class.

Well, it can't be "matter" since not all matter "occupies space" -- neither electrons nor quarks have any spatial extent, but they do have mass.

damnable quantum physicists. Always complicating Newtons vision

I think it was Huygens who complicated his vision, and Leibniz who complicated his math. The quantum physicists are the ones who pissed off Einstein :-/

Electrons occupy space, or at least the orbitals they form do.

Or maybe you thinking of a free electron, out in space without any thing interacting with it?  Or maybe a whole crowd of free electrons,  a beam of them, or something like that.  Rumor has it that any particle with momentum has wavelength too.  And if it has a wavelength then I think it can be said to "occupy space".

The orbitals define the volume of an atom or molecule not of an electron (singular). A truly "free" electron is a plane-wave solution of the Schrodinger equation, and therefore technically occupies the full volume of the universe :-/

If you want to use the deBroglie wavelength as an argument for volume, then you're claiming that the effective size of an electron is a function of its momentum. Not what we normally do when we mean "size" as a property of an object.

I'm thinking specifically of the Rutherford method of measuring the effective radius of an object from the scattering angular distribution. From Bhahba (e- - e-) scattering, we know that the inteaction radius of a free electron (the radius where the electrical repulsion would stop being pointlike, and start to look more like a billiard ball) is less than 10-20 m, and is entirely consistent with zero.

From deep inelastic scattering, in particular at HERA, we know that the interaction radius of an individual quark is less than 10-18 m, and also consistent with zero.

Hey thanks for the mention of this Bhahba e--e- scattering radius. That sounds like a better definition for the spatial "size" for an electron, and 10-20 m sounds like a good number.  I'm just glad it isn't zero, because I'd feel really uncomfortable about some physical thing having truly zero volume.  That'd just be weird, you know.  It would mean you could fit an infinite number of that thing into a suitcase. 

If you work out QED, it should be zero. Renormalization is what prevents the infinities. 10-20 m is just our current limit, based on the cross-sections and angular distributions measured at LEP-II (200 GeV e+e- collisions).