Since compressed gas generates heat, is it possible for compressed flammable gas to combust?

No, because there are three conditions for the combustion of matter:

1 There are combustibles.

2 Combustible substances (oxygen).

2 The temperature reaches the ignition point of the combustible.

All three conditions are indispensable.

Compressing flammable gas generates heat and the temperature rises, but there is no air (oxygen) and therefore does not burn.

The basic conditions for the combustion of substances are:

1) Combustibles: Regardless of solids, liquids and gases, any substances that can react violently with oxygen or other oxidants in the air are generally combustible substances, such as wood, paper, gasoline, alcohol, gas, etc.

2) Combustibles: Substances that can help and support combustion are called combustibles. Generally refers to oxygen and oxidants, mainly referring to oxygen in the air.

This oxygen is called air oxygen and accounts for about 21% of the air. Combustible substances do not burn without oxygen participating in the compound. For example, 10-12 cubic meters of air are required to burn 1 kg of oil.

It takes 4-5 cubic meters of air to burn 1 kg of wood. When there is not enough air**, the combustion will gradually weaken until it is extinguished. When the oxygen content of the air is less than 14-18%, combustion does not occur.

3) Ignition source: Any energy source that can cause the combustion of combustible substances is called an ignition source, such as open flame, friction, impact, electric spark, etc.

Only when the above three conditions are met can the substance be burned. For example, a stove can only be lit if it has three conditions: wood (combustible), air (combustible), and match (fire source).

If the compressed gas produces enough heat, it will burn when the flammable gas is mixed with oxygen, and it is possible**.

1. After the air is compressed, the density increases, and the number of gas molecules per unit volume increases, which also means that the number of oxygen molecules also increases. The fuel widens when oxygen is abundant, making it easier to burn.

2. In the process of compressing the air, the supercharger is bright, and it is also doing work on the gas, so that the internal energy of the gas increases and the temperature rises.

1. After the air is compressed, the density increases, and the number of gas molecules per unit volume increases, which also means that the number of oxygen molecules also increases. Fuel burns more easily when the oxygen is sufficient.

2. In the process of compressing the air, the supercharger is also doing work on the gas, so that the internal energy of the gas increases and the temperature rises.

After the gas is compressed by the compression stroke, the internal energy increases, the temperature rises, and when combustion, a chemical reaction occurs, and a large amount of heat is released at the same time, generating a large amount of gas, and when the volume is constant, a high-temperature and high-pressure gas is formed, so as to promote the piston to do external work. The internal energy decreases before and after the lease, and the internal energy is converted into mechanical energy.

Generally speaking, the greater the pressure of the gas, the smaller the molecular spacing, so the molecular potential energy increases, which can affect the internal energy.

Factors influencing internal energy: temperature (mainly affecting the kinetic energy of the molecule), mass (number of molecules), state (molecular spacing, and thus the potential energy of the molecule).

When air is compressed, its density increases, which means that the number of gas molecules per unit volume increases—which also means that the number of oxygen molecules increases. We know that fuel burns more easily when there is plenty of oxygen. This is one of them.

Second, in the process of compressing the air, the supercharger is also doing work on the gas (mechanical energy is converted into internal energy), so that the internal energy of the gas increases and the temperature rises.

That's why air is more conducive to combustion when compressed.

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1. It is heavier than air, not easy to diffuse, easy to gather indoors or low-lying places, and will cause ** once it encounters a fire source, so it is very dangerous.

2. The Shendan language, which is lighter than air, will spread quickly after leakage, and if it is an indoor leak, it will run away through the window, which is easy to cause **, which reduces the danger.

3. Therefore, it is usually less dangerous to use natural gas at home, and liquefied gas is heavier than air, so it is very dangerous to leak blindly once discharged.

In fact, there are two ways to increase the heating area.

First of all, the increase of the heating area leads to the increase of the heat dissipation area, and the proportion of heat loss increases and the infiltration of the reina increases.

Then, increasing the heating area increases the reaction area in the reaction, so that the ratio of the participating reactants to the added substances increases.

And the reason why exhaust gas can take away energy, I think it is because it contains unreacted substances, and its own energy is not released, but also absorbs the energy released by the substances involved in the reaction.

A more adequate reaction increases the amount of energy released and reduces the amount of unreacted material that "steals" the energy.

Therefore, under the same conditions, increasing the heating area can reduce the energy carried away by the exhaust gas.

I had a chance to deduce this process on my own.