Why should matches rub the edges of the box to ignite?

New matchbox rubbing **both.

The old one is to wear out the middle one.

Of course, you have to grind from the edge.

Maybe it's the principle of friction.

The whole of the match is easy to catch fire, and the main components of the match head are diantimony trisulfide and potassium chlorate. The matchstick is made of cork aspen or pine, the tip of which is completely impregnated with paraffin and rosin; One side of the matchbox is coated with red phosphorus and glass powder. Take a match and rub it on the edge of the matchbox with red phosphorus and glass powder, with some red phosphorus on the head of the match.

Once red phosphorus is heated by friction, it catches fire. The combustion of red phosphorus causes the potassium chlorate on the match head to release oxygen, which soon ignites the diantimony trisulfide, so the match makes a "hiss" sound and spews flames. This type of match is called a safety match.

If the matchhead is not rubbed against the side of the matchbox, it will not catch fire. In the early days, tetraphosphorus disulfide was used to make match heads. As soon as they touch a wall, the soles of their shoes, or even their clothes, the matches will burn.

It's convenient, but it's not safe.

In the early days, match heads were made of white phosphorus, which burned easily without a matchbox. But now, the production process has been changed to be on the safe side. The sides of matchboxes today are mainly composed of red phosphorus, antimony trisulfide and binder.

The current match (i.e., safety match) has the following characteristics: the composition of a safety match is as follows: the match head is mainly composed of an oxidant (potassium chloride) and combustibles (such as sulfur, etc.).

and adhesives, etc. The sides of the matchbox consist mainly of red phosphorus, antimony trisulfide and binder.

When a match is lit, the side of the match head and the matchbox are rubbed to heat. The heat released breaks down potassium chloride, producing a small amount of oxygen, and ignites the red phosphorus, which causes flammable materials such as sulfur on the match head to burn, so the match is ignited. The advantage of the safe ratio is that the red phosphorus is separated from the oxidant, which is not only safe, but also non-toxic.

So this is also known as a safety match. Match heads mainly contain potassium chlorate, manganese dioxide, sulfur and glass powder. There is a small amount of paraffin on the matchstick.

The friction layer on both sides of the matchbox consists of red phosphorus and glass powder. The main process of match ignition is: (1) when the match head moves on the matchbox, the heat generated will cause phosphorus to burn; (2) The heat released by phosphorus combustion will decompose potassium chlorate; (3) The oxygen released by the decomposition of potassium chlorate will react with sulfur; (4) The heat released by sulfur and oxygen will ignite the paraffin, which will eventually make the matchstick burn.

The match head is mainly composed of antimony trisulfide and potassium chlorate, and when it is rubbed on the matchbox, it reacts chemically with the red phosphorus on the side of the box, so it burns.

Because there is a layer of potassium chlorate and tetraphosphorus trisulfide on the side of the matchbox, this substance can produce sparks when rubbed.

There will be friction next to the match box to generate heat, which will reach the ignition point of the match, and the match contains potassium chlorate.

On top of the match is red phosphorus. The ignition point of red phosphorus is extremely low. The burning temperature can be reached by gentle rubbing.

The matchhead is gently swiped on the matchbox, the matchbox will do work on the match, the internal energy of the match increases, the temperature rises, and when the ignition point of the match head is reached, it will ignite, therefore, the burning of the match is to convert the mechanical energy into internal energy

So the answer is: inner; Do the work

The match head can be brushed by forcefully crossing the matchbox, and the friction is increased by the method of increasing the coefficient of friction.

Factors influencing the amount of friction: the amount of pressure and the roughness of the contact surface. The ways to increase friction are: increase the pressure, increase the roughness of the contact surface.

The match head is gently crossed on the matchbox is friction and heat, which belongs to the internal energy of the work to change the object The match head can be ignited by gently crossing the matchbox, and from the perspective of energy conversion, it is to convert (mechanical) energy into (internal) energy, which is achieved by (doing work).

Banquet type 1) The match is drawn on the matchbox is friction and heat is the conversion of energy, which belongs to changing the internal energy of the object by doing work, and the mechanical energy is converted into internal energy.

2) Lighting the match head close to the flame of the alcohol lamp is the transfer of energy, which is achieved by means of heat transfer

Therefore, the answer is: do blind guessing; Heat transfer

1. The composition of the matchbox ignition place: red phosphorus, diantimony trisulfide, adhesive;

2. Composition of match head: potassium chlorate, manganese dioxide, flammable material, adhesive;

3. Causes: friction and heating, decomposition of potassium chlorate, red phosphorus, and combustion of flammable substances on firewood, such as: sulfur combustion;

4. Advantages: red phosphorus is separated from the oxidant, which is more safe and non-toxic.

1. The composition of the matchbox at the burning place: red phosphorus, antimony trisulfide, adhesive;

2. Composition of match head: potassium chlorate, manganese dioxide, flammables, sticky deficiency mixture;

3. Causes: friction and heating, potassium chlorate decomposition, red phosphorus, and flammable materials on the firewood head are combusted, such as: sulfur combustion;

4. Advantages of Fu Lao: red phosphorus is separated from oxidant, which is safer and non-toxic.