The change of flame with match, what is the change of match burning

When the fire is burning, it emits a lot of heat. This heat heats up the surrounding air, and the heated air expands heat, becomes lighter, and begins to rise. In the water, light objects always float on the surface of the water.

It's the same in the air. In other words, because the air is heated into an updraft, the direction of the flame is upward. You can also understand it this way:

The fire burns upwards because the rising air or burning hot gases pull the flame up. As a result, the upper end of the flame takes on a pointed shape like the flame of a candle or the flame of a match. This shape is close to a triangle, especially at the top, which is the same as the triangle.

Since this action is constantly produced during the combustion of the object, the fire always burns upwards. It is believed that the strong winds at the site of the fire and the chimneys were able to support the combustion, all of which were caused by this strong, sharply rising air current. You can also think of the flame as it burns upwards with the rising air current.

Experimental conclusion Einstein's "in weightlessness" means that the microgravity is zero, and according to the analysis of the experimental results, its ** is correct. In NASA experiments, microgravity was present in the spacecraft, and the microgravity force level at the center of mass was about 10-6 10-4g, and the microgravity at other locations was slightly larger than the microgravity at the center of mass. So the reason why the candle doesn't go out in the experiment is that the microgravity is not small enough.

In summary, the burning of the candle flame is related to the magnitude of the microgravity. According to the experimental results, it is speculated that there are microgravity values g1, g2, g1 g2, and the candle flame is extinguished when the microgravity g g1 is present. When the microgravity g satisfies g1 g g2, the candle flame is blue spherical and can burn continuously. When microgravity g g2, the candle is yellow.

Due to the limitations of experimental conditions, this hypothesis could not be accurately evaluated.

The experiment is very simple, try it yourself, seeing is believing, this is the most reliable, dear.

What is the change in match burning: chemical change.

Match burning is a chemical change. The characteristic of chemical change is that it will inevitably produce new substances, and the combustion of matches will produce gases such as phosphorus dioxide and sulfur dioxide, so match combustion is a chemical change. Match burning is mainly caused by the heat of the stool generated by the friction of phosphorus elements and match heads on the matchbox, and the burning time of a match is usually only 3 4 seconds.

About chemical changes

Chemical changes are always accompanied by physical changes. In the process of chemical change, there are usually luminescence, exothermia, and endothermy. According to the atomic collision theory, the chemical change between molecules is accomplished through collision, and two conditions need to be met to complete the collision of the molecule that reacts

First, it has enough energy to travel; The second is the correct orientation.

The essence of chemical change can be understood from a microscopic perspective: there is no change in the type and number of atoms before and after the chemical reaction, but only a change in the way the atoms are bonded to each other, and the atoms are the smallest particles of chemical changes.

A substance made of molecules is a molecule in which atoms are recombined into a new substance. The chemical properties of a substance can only be expressed through chemical changes in the substance, so the chemical properties of the substance can be studied by the method of making the substance react chemically and a new substance can be prepared.

The symbolism of a match

The meaningful match also symbolizes the preciousness and ephemerality of life. The burning of each match means that life is short, reminding us to cherish time and strive for our ideals and happiness.

This cherishing of time and deep reflection on life may be able to change our lives, make us more clear about the direction of life, and move towards a happier and more successful future.

Incandescent bulbs.

Luminescence and heat generation are all physical changes.

In particular, when the electrons are heated, the electrons shock the molecules and cause the molecules to move violently, and they are set in a chemical environment without oxidation (guaranteed life).

Hence the physical change.

Because it reaches a certain temperature after heating, the photoelectrons are activated to produce the thermo-optical phenomenon (showing color temperature), and there is no cross combination between the atoms, so there is no chemical process, and it still belongs to the phenomenon of the unreasonable cavity of matter.

Matches burn. Heating is due to the fact that the ignition point is reached, an oxidation reaction is generated, and at the same time heat is generated, which intensifies the combustion, which is obviously a chemical change.

Luminescence is not to emit light at a certain temperature, because even a very high temperature of carbon is just a red dot, but a chemical process accompanied by photoelectron dissociation and dislike activation, resulting in a certain frequency of chromatography, so luminescence is generally considered to be the conversion of chemical energy into light energy, so I think it is a chemical change phenomenon.

After all, we are talking about phenomena, and if we use the concept of generalized physics, then chemistry is also a microscopic physical phenomenon, so there is no need to look at it this way, just use a general view.

Mainly because the chemical composition of the match head is different from the match stem.

The match head contains red phosphorus, potassium chlorate, sulfur, coagulant, etc. A small amount of red phosphorus on the match head (ignition point of more than 200) is converted into white phosphorus (ignition point 40), so the white phosphorus burns violently, causing potassium chlorate to release oxygen to support combustion, and ignites sulfur and paraffin (the flame is strongest at this time), thereby igniting the match stem (there is also paraffin on the stem).

Brothers... Nonsense... Don't you see matches with match heads???