What is the definition of combustion Does combustion necessarily require oxygen

Oxygen is not necessarily needed for combustion, and all vigorous oxidation reactions that emit light and heat are called combustion. Only the violent oxidation reaction defined in junior high school chemistry books as a luminous heat with the participation of oxygen is called combustion, because of the limitation of knowledge. Magnesium can be burned in CO2 and N2 and sodium can be burned in chlorine because nitrogen and chlorine are oxidizing, oxidizing chlorine and oxygen, CO2 is burned in N2 to produce C and MGO or Co and MGO, and Na is burned in Cl2 to form NaCl

The violent oxidation reaction between combustibles and oxygen in the air is called combustion. Usually the combustion is to be attended by oxygen, but in some special cases the combustion can be carried out under oxygen-free conditions, such as hydrogen combustion in chlorine, magnesium strips in carbon dioxide, etc.

The definition of combustion refers to the violent oxidation reaction of a substance that causes it to shine and heat up.

Because oxygen is generally required, even the dictionary explanation uses oxidation as a basic condition.

I agree with your question, I also asked the teacher this when I was in school, and the teacher was confused and unhappy by my question.

The three major elements of combustion are combustibles, combustible gases, and temperatures above the ignition point.

I think there is something wrong with the explanation in the book.

1. Oxygen is not required for combustion, and combustible gas is not only oxygen. As you mentioned.

2. Combustion is not all violent reactions, for example, many substances that oxidize slowly also heat up in combustion, but not violently. Substances such as diamond and white phosphorus do not burn violently.

So the answer is that there is still no perfect definition of this phenomenon that humans have been exposed to for hundreds of millions of years.

Combustion is a violent reaction: there is light or heat. Oxygen is not necessarily necessary. For example, hydrogen and chlorine combustion: nuclear fission**, nuclear fusion reaction (sun), positive discharge, negative discharge, positive and negative discharge, antimatter positive matter annihilation reaction.

Combustion is the process of rapid oxidation of objects to produce light and heat, and it is not necessary to have oxygen, such as mg reacts with CO2 to form MGC3

The intense glowing chemical reaction is called combustion, and it has nothing to do with the presence or absence of oxygen. There is no direct relationship.

The violent oxidation reaction of light and heat is combustion, and oxygen is just the most common accelerant.

A vigorous oxidation reaction can be called combustion.

It was preempted. The violent glowing reaction has little to do with oxygen.

It doesn't have to be that serious about definitions.

In junior high school, only oxygen can support combustion

But there were so many new things in high school.

Oxygen is not necessarily required for the combustion reaction. The three conditions of combustion are combustibles; The temperature reaches the ignition point of the combustible.

Accelerants. At the junior high school level, the third condition may be written as the presence of air or oxygen. Air and oxygen are indeed the most common accelerants, but they are not the only ones, and other substances can also act as accelerants under certain conditions. Common accelerants include chlorine and potassium chlorate.

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Burning

During combustion, momentum, heat and mass are transferred between fuel, oxygen and combustion products, resulting in a complex structure of flames, which consists of multi-component concentration gradients and non-isothermal two-phase flows. These transmissions within the flame borrow laminar flow.

Molecular transfer or turbulent micro-cluster transfer is realized, while industrial combustion equipment is mainly based on turbulent micro-cluster transfer.

Exploring the laws of velocity, concentration, and temperature distribution in the combustion chamber and how they interact with each other is a compass from fluid mechanics.

Angle to study the important content of the combustion process. Due to the complexity of the combustion process, experimental technology is the main means of sealing the finger base of the combustion project.

Computational combustion, which has been developed in recent years, is used to establish physical models of combustion processes for momentum, energy, and chemical reactions.

The numerical solution of the system of differential equations has made significant progress in the research and charging of engineering problems such as the flow field in the combustion equipment, the ignition and combustion heat transfer process of the fuel, and the stability of the flame.

1. Natural gas and oxygen ignition can produce carbon dioxide and water.

2. If oxygen is insufficient, carbon monoxide may also be generated.

3. If the oxygen is insufficient, carbon black may also be generated.

The essence of combustion is a redox reaction. Combustion does not necessarily require oxygen to participate, but needs to have an oxidant, and any luminous, heat, and violent redox reaction can be called combustion. In general, combustion requires the coexistence of three conditions to occur, namely, combustibles, oxidants, and temperatures to reach the ignition point.

Oxygen is the most common oxidizing agent in combustion reactions, but other compounds can also be oxidizing agents, such as magnesium, which can be burned in carbon dioxide, which is the oxidizing agent.

In the redox reaction, the oxidant undergoes a reduction reaction, and the corresponding product is a reduction product. It became a reducing product of the reaction.

1.When the ignited magnesium strips are placed in nitrogen, the magnesium strips can still remain burning, and a reaction occurs:

3mg+n = mgn (condition is ignition).

This reaction does not require oxygen to participate. In addition, magnesium can also be burned in carbon dioxide:

2mg+CO = 2mgo+c (condition is ignited)2The copper wire is burned in chlorine gas, producing a large amount of brownish-yellow smoke, which reacts:

Cu+Cl = CuCl (condition is ignition).

In addition, alkali metals, iron, hydrogen, etc. can also be burned in chlorine, such as:

H + Cl = 2HCl (condition is ignition).

2Fe + 3Cl = 2FeCl3 (condition is ignition).

Generally speaking, there is oxygen in the gases produced when objects are burned (if they are burned with oxygen), such as carbon dioxide, carbon monoxide, sulfur dioxide, etc. If the product produced during combustion can no longer be burned, then this combustion is called complete combustion, and its product is called complete combustion product.

Such as CO2, SO2, H2O, P2O5, etc. are complete combustion products.

During combustion, fluorine, chlorine, etc. can also be used as oxidants for combustion reactions. So, oxygen is just one of the fuels. Combustion, combustibles, but not necessarily oxygen.

Combustion requires the coexistence of three things to occur, namely combustibles, combustibles and temperatures to reach the ignition point, which is called the fire triangle of the three elements of combustion. Among them, combustibles are substances that help and support the combustion of combustibles, that is, substances that can oxidize with combustibles are called oxidants.

Uses of Oxygen:

There are many uses of oxygen, including industrial oxygen and medical oxygen. Industrial oxygen is mainly used in the smelting process, cutting, etc., and there is more oxygen in industry. Medical oxygen is mainly oxygen therapy, of course, there are also different oxygen therapy, hyperbaric oxygen therapy.

Ordinary oxygen therapy is widely used in clinical practice, especially for patients with cardiopulmonary disorders, acute and chronic respiratory failure, and hypoxemia, oxygen therapy is indispensable in hospitals. <>