How to use an alcohol lamp correctly, how many layers of its flame has, and what is the difference i

The flame of the alcohol lamp in normal use should be divided into three parts: the flame core, the inner flame and the outer flame. When heating, it should be heated by an external flame. Studies in recent years have shown that:

Theoretically, it is generally believed that the outer flame temperature of the alcohol lamp is the highest, because the outer flame is in full contact with the outside atmosphere, the energy exchange with the environment is the easiest during combustion, and the heat release is the most, resulting in the outer flame temperature being higher than the inner flame.

Lighting the alcohol lamp, it can be seen that the flame of the alcohol lamp is divided into three layers, the innermost is called the flame center, and the temperature is the lowest; The middle one is called the inner flame, and the outermost one is called the outer flame.

The main reason for the temperature difference of the same flame layer of the alcohol lamp is the ratio of alcohol vapor to air, that is, the combustion-assist ratio; Secondly, the outer layer of the flame in contact with the air also makes the flame temperature lower due to the low air temperature.

Related Notes:In terms of the whole flame, it is mainly divided into three layers, namely the inner flame, the middle flame and the outer flame, which correspond to the flammable flame, the neutral flame and the lean flame. The flame with a fuel-to-assist ratio equal to the stoichiometric relationship of alcohol when it is burned in the air is called a neutral flame or a stoichiometric flame, and a flame with a burn-to-assist ratio less than a neutral flame is called a lean flame flame, otherwise it is called a rich flame flame.

Obviously, the fire-assist ratio is not the same for the same flame layer (the higher you go, the smaller the fuel-assist ratio), so there must be a difference in the temperature of the same flame layer, and the reasons for the difference are stated above, which mainly depends on the combustion aid ratio of alcohol vapor to air.

The flame temperature of the same layer should be the same, and only when affected by the ambient airflow, the side of the airflow will be colder. The flame temperature of different layers, the outer layer is higher than the inner layer because the fuel can be in full contact with oxygen, oxygen-rich combustion, and the temperature is higher than that of oxygen-poor combustion.

The amount of alcohol in contact with oxygen directly affects the temperature of the flame, and in the whole flame, the outer flame is in contact with oxygen more, so the temperature is high. Even if it is in the same flame layer, there will be a difference in the mixing ratio with oxygen, that is, whether the combustion is complete and the degree of combustion is still different in the same layer, resulting in a temperature difference in the same layer.

The flame of the alcohol lamp is divided into three layers: the outer flame, the inner flame and the flame core, among which the outer flame has the highest temperature and the flame core has the lowest temperature. Alcohol lamp is a heating tool fueled by alcohol, which is widely used in laboratories, factories, medical treatment, scientific research, etc. Since it does not produce smoke during combustion, it can also be sterilized by burning the instrument.

Due to the heat generated during the combustion of the alcohol lamp, other experimental materials can be heated. Its heating temperature reaches 400-1000 or more. And it's safe and reliable.

Alcohol lamps are divided into hanging alcohol blowtorches and seated alcohol blowtorches, as well as the conventional alcohol lamps mentioned in this article.

Main Applications:

In chemical experiments, alcohol lamps are commonly used for low-temperature heating. However, when it is used for experiments that require high temperatures, such as "reduction of copper oxide from charcoal", it is difficult for alcohol lamps to be effective. In addition, when the flame color reaction is performed with an alcohol lamp, the yellow flame of the alcohol lamp will also interfere with the experimental phenomenon.

How to increase the temperature of the flame of the alcohol lamp and eliminate the yellow color of the flame of the alcohol lamp has always been a major problem in the teaching of chemistry laboratory in middle schools. The "colorless flame multi-purpose alcohol lamp" we developed integrates alcohol lamp and blowtorch, and can cleverly eliminate the "yellow" of the lamp flame under the condition of normal ignition, which provides convenience for flame color reaction, glass tube processing, general heating and high temperature and strong heat experiments.

Hello! The flame of the alcohol lamp is divided into three layers: outer flame, inner flame and flame core. The outer flame temperature is the highest.

The reason for the difference in temperature of the same flame layer in different alcohol lamps should be found from the wick.

Possibly: 1. The thickness of the wick is different.

2. The material of the wick is different, some are cotton, and some are chemical fiber.

3. Whether the wick is stuck too tightly when it is fixed on the wick tube.

When in doubt, please ask.

Because the external flame reacts most violently with air alcohol, it is the hottest; The middle layer is bright because of the combustion of toner with air; The inner flame has only a small amount of oxygen and toner, so it is neither hot nor bright. Combined with the above conclusions and wicks, alcohol composition and reactions, it can be written.

For example: the thickness of the wick is different, the length is different, and the material is different; The amount of alcohol varies; the tightness of the wick bayonet, and so on.

What flame is used for alcohol lamp heating? Does anyone know about this issue (1).

Heat with an outer flame.

Because the temperature of the outer flame is about 500 degrees Celsius, while the inner flame is only about 300 degrees Celsius.

The alcohol lamp flame is divided into three layers, and the outer layer has the highest temperature.

The flame is generally divided into three layers, with an inner layer of dark blue flame. Due to insufficient oxygen supply, the combustion is incomplete and the temperature is the lowest. It has a reducing effect, called the flame center or reducing flame.

The middle layer is dark red or light yellow flame, bright. The temperature is higher than the inner layer, which is called the inner flame. The front layer of the outer relatives is colorless, because of the sufficient oxygen supply, the combustion is complete, and the temperature is the highest.

There is oxidation, called external flame or oxidation flame.

When heating items, they should be heated with an external flame so that the heating effect can be achieved at its best. And the flame of the alcohol lamp should be extinguished with a lid, not blown out. The main fuel of the alcohol lamp is alcohol, which has the characteristic of not producing smoke when burned.

It is very safe and reliable, and is widely used in various fields. However, in use, you must be careful not to knock it down, and if you accidentally knock it down, you should use a wet rag to extinguish the flame in time to prevent the occurrence of fire.

Alcohol introduction

Ethanol is a type of alcohol, and organic compounds, commonly known as alcohol, are the most common monoalcohols. It is a colorless transparent liquid that is flammable, volatile, and has a special fragrance at room temperature and pressure. It is a commonly used fuel, solvent and disinfectant, and is also used in organic synthesis, and ethanol is an isomer of methyl ether.

The ethanol molecule is composed of three atoms, C, H, and O, and can be seen as the product of the substitution of a hydrogen atom in the ethane molecule by a hydroxyl group. It can also be seen as a product of a hydrogen atom in a water band molecule that is replaced by an ethyl group. The liquid density of ethanol is, and the density of ethanol gas is.

The relative density is . The boiling point is, 14 closed flash point, and the melting point is.

The amount of contact between the flame and the oxygen, for example, the outer flame is in contact with the oxygen a lot, so the temperature is high.

1.Alcohol by volume 2The length of the wick that exposes the alcohol lamp.

The temperature of the flame in the same layer is also different from the inside and outside, and the reason is also the contact with oxygen, which leads to different degrees of reaction.