Sol88
Philosopher
- Joined
- Mar 23, 2009
- Messages
- 8,321
Tusenfem wrote:
Let's get this straight then tusenfem because I think this is where the misunderstanding is, so lets clear it up once and for all!!
You say plasma is a gas, which just happens to have a couple pesky free charged particles whizzn round in it, I say plasma is a distinct state of matter and that is NOT a gas!
First a little background on plasma
But plasma can be a weakly ionized gas, but gas can not be a plasma!
And unlike Tusenfems assertion that plasma
eg
And
Further more
So plasma's do not just form from collisions, shock fronts and accretions or any other mechanical or gravity related phenomena but can also use electrical power, as per ya garden variety EU/PC theory!
plus
So my real beef is press release's , science articles and books that our children read all say GAS, which is a GAS. but a ionized GAS is a plasma and it conforms to different equations!! ie
Gas can not do what plasma does!!!
Am I misunderstanding anything here Tusenfem?
When we talk about GAS we are talking about a non ionized gas and when we are talking plasma we are not talking about non ionized gas, but when a press release or paper talks about 100,000,000 degree gas, are we talking about a plasma or a gas?
lets take wiki's article on the Bullet cluster shall we.
Gas or plasma, Tusenfem?
Sol88 still does not get that a plasma is a gas. Somehow he thinks that when a gas gets ionized, it stops being a gas and starts being a plasma. Both are wrong. An ionized gas, is a gas, that happens to consist of charged particles, but still adheres to the gas laws (quite possibly with another adiabetic constant). So, to be clear on this a plasma is a gas.
Let's get this straight then tusenfem because I think this is where the misunderstanding is, so lets clear it up once and for all!!
You say plasma is a gas, which just happens to have a couple pesky free charged particles whizzn round in it, I say plasma is a distinct state of matter and that is NOT a gas!
First a little background on plasma
Thus the term "plasma" was first used to describe partially (if not weakly) ionized gases. The term plasma apparently did not find immediate widespread use in the scientific community. It did eventually catch on, however, but in some cases the term was inappropriately limited to highly ionized gases.
During the 1920's Irving Langmuir was studying various types of mercury-vapor discharges, and he noticed similarities in their structure - near the boundaries as well as in the main body of the discharge. While the region immediately adjacent to a wall or electrode was already called a "sheath," there was no name for the quasi-neutral stuff filling most of the discharge space. He decided to call it "plasma."
But plasma can be a weakly ionized gas, but gas can not be a plasma!
When enough atoms are ionized to significantly affect the electrical characteristics of the gas, it is a plasma
What is a Plasma?
Plasma is overwhemingly the dominant constituent of the universe as a whole. Yet most people are ignorant of plasmas. In daily life on the surface of planet Earth, perhaps the plasma to which people are most commonly exposed is the one that produces the cool efficient glow from fluorescent lights. Neither solid, nor liquid, nor gas, a plasma most closely resembles the latter, but unlike gases whose components are electrically neutral, plasma is composed of the building blocks of all matter: electrically charged particles at high energy.
Plasma is so energetic or "hot" that in space it consists soley of ions and electrons. It is only when plasma is cooled that the atoms or molecules that are so predominant in forming gases, liquids, and solids that we are so accustomed to on Earth, is possible. So, in space, plasma remains electrically charged. Thus plasmas carry electric currents and are more influenced by electromagnetic forces than by gravitational forces. Outside the Earth's atmosphere, the dominant form of matter is plasma, and "empty" space has been found to be quite "alive" with a constant flow of plasma
And unlike Tusenfems assertion that plasma
it does notadheres to the gas laws (quite possibly with another adiabetic constant)
eg
LINKErrors in perception have also been made, especially in the case of 'Ionized Gases,' a topic studied intensely in the early 1900's. However, gases and plasmas are distinct states of matter. The fluids states of gas and liquid are treated with the Navier-Stokes equation whereas plasmas are treated with the Boltzmann and Maxwell equations.
Liquids & Gases use Fluid Systems (Navier-Stokes)
And
Plasmas use Electromagnetic Systems (Maxwell-
Boltzmann)
Further more
Plasma consists of a collection of free-moving electrons and ions - atoms that have lost electrons. Energy is needed to strip electrons from atoms to make plasma. The energy can be of various origins: thermal, electrical, or light (ultraviolet light or intense visible light from a laser). With insufficient sustaining power, plasmas recombine into neutral gas.
Plasma can be accelerated and steered by electric and magnetic fields which allows it to be controlled and applied. Plasma research is yielding a greater understanding of the universe. It also provides many practical uses: new manufacturing techniques, consumer products, and the prospect of abundant energy.
So plasma's do not just form from collisions, shock fronts and accretions or any other mechanical or gravity related phenomena but can also use electrical power, as per ya garden variety EU/PC theory!
plus
In analysis, plasmas are far harder to model than solids, liquids, and gases because they act in a self-consistent manner. The separation of electrons and ions produce electric fields and the motion of electrons and ions produce both electric and magnetic fields. The electric fields then tend to accelerate plasmas to very high energies while the magnetic fields tend to guide the electrons. Both of these mechanisms, the accelerated (or fast) electrons and the magnetic fields produce what is called sychrotron radiation, so called because it was first discovered in large magnetized containers of electrons beams in laboratories on earth.
Because of their self-consistent motions, plasma are rampant with instabilities, chaosity, and nonlinearities. These also produce electric and magnetic fields but also electromagnetic radiation
So my real beef is press release's , science articles and books that our children read all say GAS, which is a GAS. but a ionized GAS is a plasma and it conforms to different equations!! ie
In spite of their mathematical complexity, the acknowledgment of their existence throught space and utilization in industrial processes (80% of the manufacture of computing chips requires a plasma) it is time to acknowledge that 'plasmas' are for everyone.
Gas can not do what plasma does!!!

Am I misunderstanding anything here Tusenfem?
When we talk about GAS we are talking about a non ionized gas and when we are talking plasma we are not talking about non ionized gas, but when a press release or paper talks about 100,000,000 degree gas, are we talking about a plasma or a gas?

lets take wiki's article on the Bullet cluster shall we.
The Bullet cluster is one of the hottest known clusters of galaxies. Observed from Earth, the subcluster passed through the cluster center 150 million years ago creating a "bow-shaped shock wave located near the right side of the cluster" formed as "70 million degree Celsius gas in the sub-cluster plowed through 100 million degree Celsius gas in the main cluster at a speed of about 6 million miles per hour".
Gas or plasma, Tusenfem?
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