What does melting mean? What is the molten state

Definition: The process by which a material is transformed from a solid state to a melt by an increase in temperature. When the temperature rises, the thermal movement of the molecule increases, resulting in the destruction of crystallization and the process of changing the substance from crystalline phase to liquid phase.

Melting is a first-order phase transition, and melting has an increase in enthalpy, entropy, and volume. The temperature at which melting occurs is called the melting point or melting temperature. The melting point temperature range of small molecule crystals is very narrow (generally less than 1), while polymers are incomplete due to incomplete crystallization; The melting temperature tends to be in a wide range (generally 10 20).

A substance that is solid at room temperature melts after reaching a certain temperature and becomes a liquid state, which is called a molten state. It is also in liquid form, but it is unstable at room temperature.

Melting: A substance that is solid at room temperature melts after reaching a certain temperature and becomes a liquid state, which is called a molten state.

It is also in liquid form, but it is unstable at room temperature.

It is divided into eutectic and eutectic.

Eutectic – refers to the low eutectic point in the phase diagram, specifically refers to the eutectic at the point where several phases cool down to the point where eutectic begins, and eutectic – the meaning of melting together.

The meaning of melting: it refers to the process in which the kinetic energy of the thermal motion of the molecule increases when the temperature rises, resulting in the destruction of crystallization and the change of substance from crystalline phase to liquid phase; It is a first-order phase transition with an increase in enthalpy, entropy, and volume.

The temperature at which melting occurs is called the melting point or melting temperature. The melting temperature range of small molecule crystals is very narrow (generally less than 1), while the melting temperature of polymers is often a wide range due to incomplete crystallization (generally 10 20).

Principle:

The ignition point of raw fibers.

Heat of combustion, flame temperature.

and oxygen restriction index, which have a decisive role in the degree of flammability and the spread and expansion of fire. Some fibers are melted by heat while burning, and they are separated from the fire source like candle oil.

It has a relieving effect on combustion, but if the melt comes into contact with **, it will cause serious burns that are difficult to peel.

Synthetic fibers have melting problems, fabrics blended with cellulose fibers.

In the test, it is possible to do not drip molten matter, but the problem of sticking burns** still exists, after flame retardant finishing, or adding flame retardant to the synthetic fiber spinning solution.

It can make the synthetic fiber meet the flame retardant requirements, but the melting point changes little.

The above content refers to Encyclopedia - Melting.

At room temperature, the solid substance melts after reaching a certain temperature, and when the temperature rises, the thermal movement energy of the molecule increases, resulting in the destruction of crystallization, and the process of changing the substance from the crystalline phase to the liquid phase becomes a liquid state, which is called the molten state.

Melting refers to the process of increasing the kinetic energy of the thermal movement of the molecule when the temperature rises, resulting in the destruction of crystallization, and the change of matter from the crystalline phase to the liquid phase. The melting temperature range of small molecule crystals is very narrow, while the melting temperature of polymers tends to be a wide range (generally 10 20) due to incomplete crystallization.

Ionic compounds can conduct electricity in either the aqueous solution or the molten state, whereas covalent compounds can only conduct electricity in the aqueous solution and cannot conduct electricity in the molten state. Ionization does not require external conditions such as energization, and ions can be produced in a molten or aqueous solution, and the electrolytes that can only be ionized in the molten state are active metal oxides, which do not exist in the solution, so they cannot be proved by the generation of ions in the solution.

After some substances are dissolved in the molten state or by solvents, although they lose the rigidity of solid substances, they acquire the easy fluidity of liquids, and retain the anisotropic orderly arrangement of some crystalline substance molecules, forming an intermediate state with some properties of crystals and liquids.

A substance that is originally solid at room temperature (it must be a pure substance rather than a mixture) reaches its melting point at a certain temperature and becomes a liquid substance, which has some physical properties of liquid, which is called the molten state of the substance.

For example, elemental aluminum becomes liquid aluminum when its melting point is degrees; Another example is that solid sodium chloride becomes liquid sodium chloride at degrees;

The molten state is only for pure substances, and if it is a solid substance but a mixture, there is no fixed melting point and there is no molten state. For example, glass.

When some solid substances are heated, they directly become gaseous substances without going through the liquid process, which is called sublimation, and because they do not go through the liquid state, there is no molten state, such as iodine.

The reaction conditions of the reaction in the molten state are generally high temperatures. The extended concept of the molten state, i.e., high temperature, is generally used. It is only a reaction condition and should not be confused with the definition.

The molten state is a term used in chemistry, which corresponds to the solid-liquid coexistence state in physics. Only crystals may be in a solid-liquid coexistence state at the melting point.

The definition is: when the temperature rises, the thermal movement energy of the molecule increases, resulting in the destruction of crystallization and the process of changing the substance from the crystalline phase to the liquid phase.

To put it simply: a substance that is solid at room temperature melts after reaching a certain temperature and becomes a liquid state, which is called a molten state.

Here's an example: a piece of iron, you melt it into molten iron

What is the state of melting; When the temperature of fusion increases, the thermal movement energy of the molecule increases, resulting in the destruction of crystallization and the process of changing the substance from crystalline phase to liquid phase. Melting is a first-order phase transition, and melting has enthalpy and entropy.

Liquid is the molten state of solids, e.g. molten iron is the molten state of iron. Iron is turned into molten iron at more than 1,500 degrees.

First, the reference is different.

1. Melting: refers to the process of changing a substance from a crystalline phase to a liquid phase.

2. Melting: The process by which one substance (solute) is uniformly dispersed in another substance (solvent).

3. Melting: refers to the process of solid absorbing heat and turning into liquid.

Second, the source is different.

1. Melting: Wei Wei "Zhuang Xingji: The Flower of Happiness Blooms for the Warriors": "Does he live for the individual and for the few, or does he fuse his individual into the collective, live for the collective, for the majority." ”

2. Melting: Ye Shengtao "Offline: A Youth": "When the ice touches the spring temperature, it melts into ripples. ”

3. Melting: Lao She, "How I Write Erma": I wrote to him, saying that I was melting the literary language into the vernacular, so as to improve the vernacular, and make the vernacular a thing that can be appreciated by both the elegant and the vulgar. ”

"Melting" is not the same as "melting", "melting" refers to the melting of ice or snow into water due to temperature or sunlight. "Melting" refers to the process by which a substance is heated to change from a solid state to a liquid state.

Melting" in a sentence:

1. The hot sun quickly melts the ice.

2. Her explanation made me melt my resentment towards her in my heart.

3. The snowflakes fell on my face and slowly melted into water droplets.

4. The dream is like a snowflake, fluttering in the air, trying to catch him, he has melted.

Melting" in a sentence:

1. Our mission is to illuminate the whole world, melt the darkness in the world, find harmony between ourselves and the world, and establish our own inner harmony.

2. Melt tolerance into a sincere smile, and you can feel the charm of human nature.

3. The aluminum begins to melt into a liquid, and then converges into a stream and flows on the road surface.