Does burning have to glow? Combustion is an exothermic glowing reaction

Of course, combustion is a chemical reaction process that generates heat and emits light. Generally, it refers to a violent oxidation reaction that generates heat and luminesce. Combustibles can only burn when they reach their ignition point in air or oxygen.

When combusted, gaseous or vapor combustibles will have flames, such as hydrogen and gasoline. Whereas, iron burns without iron vapor, so there is only sparks and no flame.

When the substance is burned, it undergoes a violent oxidation reaction, and when the exothermic concentration is concentrated, the temperature rises, so it emits light. Luminescence is characteristic of combustion.

The combustion of gaseous substances is due to the action of active air currents. The gas burns and glows to form a flame. For example, the combustion of acetylene.

The combustion of liquid substances must first be vaporized, and the combustion of vapors has a flame. For example, the burning of alcohol.

When solid substances are burned, some are melted first and then vaporized, and they are also vapors burning, and there are flames, such as sulfur and candle burning; Some are directly gasified into vapor and then combusted, and such combustion also has flames, such as the combustion of red phosphorus; Some solids are difficult to vaporize into vapor, but burn directly, so there is only sparks, no flames. The spark is the burning of granular solid debris and the absence of flames, such as the burning of iron wire.

Burning doesn't have to glow, and glowing doesn't have to burn! Luminescence is a form of energy that is transferred outward when the temperature reaches a certain value! All we can see is the visible band of light!

Combustion as we understand it is a chemical reaction that produces light and heat. Any concept is in a relative category, which is the basis of epistemology. Combustion is not a very strictly defined chemical concept, it's just that in our conceptions, it stands for:

Intense chemical reactions accompanied by light and heat. ”

I don't think it has to be luminous to burn. Spontaneous combustion of metal does not emit light. Spontaneously combusting iron, no one will ever see it glow.

The sodium reaction in water is also called combustion, but it doesn't emit light, and I personally think it doesn't have to be luminous -- at least if it's oxidation...

There should be some oxidation reactions that don't emit much energy and emit light that can't be seen, such as infrared rays and the like.

I don't think so, but I don't have a basis.

I don't think it has to be luminous to burn.

The phenomenon of luminescence and heat generation is not necessarily combustion, for example, the luminescence and heat release when the lamp is energized do not belong to combustion. Combustion requires combustibles, combustibles, and ignition sources at the same time. Combustion refers to the exothermic reaction between combustibles and oxidants, usually accompanied by flames, luminescence and smoke.

Combustion is a chemical reaction in which one or more substances (also known as reactants) are chemically transformed into products that are different from reactants.

A chemical change is defined when one molecule comes into contact with another molecule to synthesize a macromolecule; or the molecule is broken apart to form two or more small molecules; Or the reorganization of atoms within a molecule. In order to form a change, the chemical reaction is usually related to the formation of chemical bonds and the breaking of the bond. Special attention is paid to chemical reactions that do not alter the nucleus in any way, but are limited to electron cloud interactions outside the atom.

Although a chemical reaction may be triggered after nuclear deformation, a nuclear reaction has nothing to do with a chemical reaction.

In chemical reactions, it is often accompanied by luminescence, heating, discoloration, and precipitate. The basis for determining whether a reaction is chemical is whether the reaction produces a new substance. According to the theory of chemical bonds, it can be judged whether a chemical reaction is based on whether there is the breaking of old bonds and the formation of new bonds in a change process.

Chemical properties are properties that can only be exhibited in chemical changes, such as acidity and alkalinity, redox properties, thermal stability, reactivity, and so on. The essence of a chemical reaction is the process of breaking old chemical bonds and forming new chemical bonds.

Exothermic, luminescent, and the generation of new substances (e.g., carbon dioxide and moisture are generated after wood is burned, leaving carbon and ash behind) are the three characteristics of combustion phenomena. Combustion is an oxidation reaction in which oxygen is the most common oxidizing agent, but the oxidant is not limited to oxygen, and oxidation is not limited to the combination of oxygen.

The heat emitted by fuel combustion is still the main source of energy for people**, and its purpose is not to prepare products, but to obtain energy.

Combustion is a chemical reaction that heats up and emits lightThe reaction process is extremely complex, the chain reaction of free radicals is the essence of the combustion reaction, and light and heat are the physical phenomena that occur during the combustion process. Combustibles undergo a rapid exothermic and luminescent oxidation reaction with oxygen or air and appear in the form of a flame. The combustion of coal, oil, and natural gas is the main thermal energy power of all sectors of the national economy.

On the other hand, the development of fire prevention technology for the purpose of eliminating combustion has also promoted the research of combustion theory.

Principle of energy transfer for combustion:During combustion, the fuel, oxygen, and combustion products transfer momentum, heat, and mass transfer to form a flame, a complex structure with multi-component concentration gradients and non-isothermal two-phase flows. These transfers within the flame are achieved by laminar molecular transfer or turbulent micromass transfer, while industrial combustion units are dominated by turbulent micromass transfer.

The law of the velocity, concentration and temperature distribution in the combustion chamber and the interaction between them are important contents of the study of the combustion process from the perspective of fluid mechanics.

Combustion is a chemical reaction that heats up and emits light

The reaction process is extremely complex, the chain of free radicals should be the essence of the combustion reaction, and light and heat are the physical phenomena that occur during the combustion process.

The propagation of the flame front in the combustible mixture forms a combustion wave. There are two ways of propagation of combustion waves: one is normal combustion, which is caused by increasing the temperature of uncombustible gas through heat transfer, or combustion due to the reaction caused by the diffusion of active intermediate substances into uncombustible gas.

Normal combustion typically has a flame velocity of about 50 cm sec, a flame thickness of several millimeters under normal pressure, and combustion is completed within the combustion wave.

This is the case with ordinary combustion equipment and combustion in jet engines. The other type is detonation (also known as detonation), which is propagated by extremely thin shock waves, and the pressure on both sides of the wave surface can be ten times different from the temperature guess degree or even more, so that the combustibles can quickly complete the reaction in the combustion zone after the shock wave.

Detonation can propagate at speeds of up to 2 5 kilometers per second (gases) or 8 9 kilometers per second (solids and liquids), making them highly destructive.

In the combustion process, the momentum, heat and mass transfer between the fuel, oxygen and combustion products are carried out, forming a complex structure of multi-component concentration gradient and isothermal two-phase flow of the flame. These transfers within the flame are achieved by laminar molecular transfer or turbulent micromass transfer, while industrial combustion units are dominated by turbulent micromass transfer.

General chemical definition of combustion: Combustion is a kind of coarse luminescence and heating caused by combustibles and combustibles (oxidants).

vigorous oxidation reactions.

Broad definition of combustion: Combustion refers to any violent reaction that emits light and heat, and does not necessarily involve the presence of oxygen, such as sodium metal.

Na) and chlorine (Cl2) to form sodium chloride.

NaCl), which does not involve oxygen, but is a violent chemical reaction that emits light and heat, and belongs to the category of combustion like Liang Dan. It doesn't have to be a chemical reaction, such as the combustion of nuclear fuel.

Therefore, combustion is not necessarily a chemical reaction, so there is no redox.

What a reward

Not necessarily.

The definition of combustion is luminous and heat-emittingVigorous redox reactions

Non-redox reactions, or reactions that are not violent, may not produce much heat (objectively exothermic reactions) to achieve luminescence.

The most famous is of course the luminescence of fireflies, during which ATP decomposition occurs, 95% of the energy is used to make the fluorescein electrons become excited, emitting light when the electrons jump to a lower level, and 5% of the energy is used to generate heat, which is "cold light" (but it is indeed ...... heat).）

There are also forensic exploration of the death scene will spray luminol reagent to ask the victim how the blood was sprayed before death, and that process is also an exothermic reaction based on luminescence (but the heat is very small, mainly dissipated in the form of light energy).

Chemical reaction.

The reaction process is extremely complex, the chain reaction of free radicals is the essence of the combustion reaction, and light and heat are the physical phenomena that occur during the combustion process.

Combustion is an intense chemical reaction with both exothermic and luminescent effects. Exothermic, luminous, and the formation of new substances (e.g., carbon dioxide and water are produced after wood is burned, leaving carbon and ash behind) are the three characteristics of combustion phenomena.