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Plasma is the fourth state of matter, the ionized "gas". In nature, blazing flames, dazzling lightning, and the magnificent aurora are the result of plasma. For the entire universe, almost 99 9 or more matter exists in the plasma state, such as stars and interplanetary space, which are composed of plasma.
with artificial methods, such as nuclear fusion.
Nuclear fission, glow discharge, and various discharges can produce plasma. When the temperature of ordinary gas rises, the thermal motion of gas particles intensifies, so that there is a strong collision between particles, and the electrons in a large number of atoms or molecules are knocked out, when the temperature is as high as one million to 100 million kai, all gas atoms are ionized The total negative charge of the free electron starved by ionization is equal to the total positive charge of positive ions This highly ionized, macroscopicly neutral gas is called plasma The plasma TV discharge space is filled with neon, xenon and other mixed noble gases.
as a working medium. The inner surface of the two glass substrates is coated with a metal oxide conductive film as an excitation electrode. When a voltage is added to the electrode, the mixed gas in the discharge space is discharged plasma. Gas plasma discharges produce ultraviolet light.
Ultraviolet light excites the phosphor screen, which emits visible light.
The image is revealed. When used painted with three primary colors.
Also known as three primary colors.
When the phosphor screen is used in the cherry light screen, the ultraviolet rays excite the phosphor screen, and the light emitted by the phosphor screen is red, green, and blue.
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Heat is the amount of process.
However, according to what you said here, I think you should be referring to the release of internal energy by plasma to generate heat, right?
Plasma is the fourth state of an object, which is the state of positive ions and electrons (or negative ions) formed by the ionization of atoms (molecules) of matter.
Let's take the plasma state of mercury as an example, because many fluorescent lamps are coated with mercury powder on the inner wall, and the high pressure causes the solid mercury to form mercury vapor, and then the mercury ionizes to form a plasma with (hg+), hg(2+)] and electrons.
After the electron is ionized, it is attracted by the nucleus, and when it is recaptured, it will emit a certain frequency of light, which is also the luminous principle of electric light.
To make the plasma exothermic, it is necessary for a low-temperature heat source to contact with the plasma to absorb the energy released during the capture and deexcitation of the electrons, and then because there is no excess energy to supply the plasma to maintain the state of positive ions-electrons, then more and more electrons will be captured, and then the nuclear deexcited, which breaks the original dynamic equilibrium of plasma excitation-ionization-capture-deexcitation, and the plasma is converted to the gaseous state, and then to the liquid state, to the solid state. The energy in the system is gradually reduced and transferred to the low-temperature heat source in the form of heat.
Because the plasma state exists at extremely high temperatures, it is possible to release a large amount of heat from the plasma state
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Microscopically, plasma is produced by a variety of processes.
In high-temperature, high-heat gases, ionization occurs when gas atoms and molecules in the high-energy part of the gas are distributed at high velocity.
The most common ionization process is electron collision ionization. Electrons (there are always residual electrons in space) are accelerated by an electric field, and ionization occurs when the energy is higher than the ionization energy of gas molecules and atoms.
In laboratories, industrial applications (plasma color TVs), the vast majority of plasma is generated by an electric field discharge.
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Plasma is the ionized gas that is excited, reaching a certain degree of ionization (>10-4), the gas is in a conductive state, and the ionized gas in this state shows collective behavior, that is, the movement of each charged particle in the ionized gas will affect the charged particles around it, and it is also constrained by other charged particles. Since the overall behavior of the ionized gas is electrically neutral, that is, the number of positive and negative charges in the ionized gas is equal, this gas state is called the plasma state. Because its unique behavior is completely different from that of solid, liquid, and gaseous states, it is called the fourth state of matter.
In summary, plasma is composed of a large number of free electrons and ions and a small number of unionized gas molecules and atoms, and behaves as a whole as an ionized gas that is approximately electrically neutral. The plasma has the properties of Debye shielding and quasi-neutralization. Debye shielding refers to the phenomenon that an electric field is introduced into the plasma, and after a certain period of time, the electrons and ions in the plasma will move, shielding the electric field; Quasi-neutrality refers to the phenomenon that the number of positive and negative charges is almost equal inside the plasma.
There are three basic conditions for the existence of plasma: first, the spatial scale requirement, that is, the linearity of the plasma is much greater than the Debye length; The second is the time scale requirement, that is, the plasma collision time and existence time are much greater than the characteristic response time; The third is the aggregate requirement, that is, the number of particles in the Debye sphere is sufficient to be statistically significant.
Plasma can be divided into two categories: artificial plasma and natural plasma; According to the state of matter, it can be divided into three categories: gas plasma, liquid plasma and solid plasma; According to the temperature, it can be divided into two categories: high-temperature plasma and low-temperature plasma. Among them, the temperature of the particles in the high-temperature plasma is as high as tens of millions or even hundreds of millions of degrees, which is to make the particles have enough energy to collide and achieve nuclear fusion reactions; The temperature of the particles in the low-temperature plasma also reaches thousands or even tens of thousands of degrees, which can dissociate, ionize, and combine molecules and atoms. Therefore, the temperature of the low-temperature plasma is not low, and the so-called low temperature is only relative to the high temperature of the high-temperature plasma.
High-temperature plasma is mainly used in controlled nuclear fusion in the energy field; Low-temperature plasma is used in many fields of science, technology and industry. The plasma used to prepare nanomaterials is usually a low-temperature plasma with a maximum temperature of 100,000 k, usually generated by gas discharge. According to whether there is a chemical reaction in the formation process of nanomaterials, the preparation of nanomaterials can be divided into two types: plasma physics method and plasma chemistry method.
The former is mainly used for the preparation of pure material nanomaterials; The latter is mainly used for the preparation of compound nanomaterials. Pick me!!
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I'm a senior in high school, and I may not know it very thoroughly, after all, your closed-world problem may not be within the scope of high school, and we have done so many questions without focusing on this kind of problem.
The first question, the water is not all H2O, there will also be H+, Oh-, H3O+ or something, I feel that it can be vividly understood that water molecules are attractive to solute molecules, so the anions and cations are dismantled and bent The manuscript is opened, and when you do the question, you understand it as scattering sand in the air, that feeling is that the solute molecules enter the water, and the strong electrolyte will be completely dispersed, and the weak electrolyte is a lot of big stones that cannot be dispersed.
The second problem is that you can treat the anion and cation as positive and negative charges, and bury the electrons to form the anion and cation, so you will be stressed in the electric field.
Take a look at this link, it's comprehensive. Hope it helps.
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