How do you put the thing with the highest melting point?

w***3's is not entirely correct.

The landlord can refer to the old version of "100,000 Whys" in the "why molten steel can be filled with pig iron ladle".

The landlord can do an experiment with this problem: fold a small cardboard box with ordinary white paper (but not too thick), fill the carton with some water, and then put a lit candle under the carton, and you will find that the carton can boil water. As long as the water does not dry, the carton will not burn.

Understand, for molds with high temperature (high above the melting point of the mold), as long as the heat dissipation is done, it is completely fine. Just like a nuclear reactor, the core temperature is tens of millions of degrees, much higher than that of a graphite container, but as long as the heat dissipation and heat conduction are done, there will be no problem.

In addition, some ultra-high temperatures (tens of millions to hundreds of millions of degrees), because the matter is in a plasma state at this time, can be "contained" by electromagnetic levitation confinement, which is exactly what countries are currently actively conducting for controlled nuclear fusion.

They are not placed in molds to make shapes, they are shaped with a hammer in semi-liquid steel.

If you put steel (liquid) in a mold, you will be able to put it in a mold. The liquid state of the high-temperature material is poured into the mold, and the mold will quickly absorb heat, but generally the mold has not melted away, and the liquid material will become solid.

The landlord knows about alloys, which have a higher melting point than all raw materials, so that container is made of alloy.

For example, tungsten steel alloy has a higher melting point than tungsten.

Molds made of refractory clay will do.

Instead of being placed in molds to make shapes, they are "carved" out with thousands of laser shots.

Yes in the case of weightlessness. There is no need for containers at this point.

Some materials that require high purity do just that, because there is no contamination of the mold or container.

3rd Floor Error! The melting point of an alloy is generally lower than that of any component!

It's not that if you put it in the mold, it will stick to the mold.

A few people upstairs all have a lot of sense!! Huh

1. The melting and boiling points of the main group elements are seen from the periodic table.

The melting point of the same main group element is basically lower and lower as the lower the metal. The melting and boiling points of non-metallic elemental elements are gradually higher. However, the carbon group elements are special, that is, the lower the melting point of C, SI, GE, and Sn downwards, which is similar to the metal group. Also, the melting point of gallium in group A is lower than that of indium and thallium, and the melting point of tin in group A is lower than that of lead.

2. From the crystal type, the law of melting and boiling point is seen.

The melting and boiling points of atomic crystals are higher than those of ionic crystals and higher than those of molecular crystals. Elemental metals and alloys belong to metal crystals, in which the proportion of high melting and boiling points is large (but there are also low).

In atomic crystals, the shorter the covalent bond between the bonding elements, the greater the bond energy, the higher the melting point. When judging, the bond length and bond energy can be deduced from the atomic radius and then compared.

Principles of Physics

Melting point is the temperature at which a solid transforms (melts) its state of matter from a solid state to a liquid state, abbreviated as. The melting point of a DNA molecule can generally be expressed in terms of TM. The temperature at which the opposite action takes place (i.e., from a liquid to a solid state) is called the freezing point.

Unlike boiling point, melting point is less affected by pressure. In most cases, the melting point of an object is equal to the freezing point.

The melting point is essentially the temperature at which the solid and liquid phases of the substance can coexist and be in equilibrium, taking ice melting into water as an example, the melting point of ice at an atmospheric pressure is 0, and when the temperature is 0, ice and water can coexist, if there is no heat exchange with the outside world, the state of ice and water coexistence can remain stable for a long time.

The above content reference: Encyclopedia - Melting Point.

Question 1: What does melting point mean, what does boiling point mean Melting point is the temperature at which a substance can just change from a solid state to a liquid state, that is, the temperature at which it melts, and it will melt above this temperature. The boiling point is the temperature at which a substance can change from liquid to gaseous, that is, the temperature at which it boils, and above this temperature it will boil.

Question 2: What does melting point mean, the temperature at which the crystal melts.

Question 3: What is melting point? Melting Limit When the melting temperature (melting point) of a crystalline polymer is undefined, its melting process occurs over a wide range of temperatures, known as the melting range, or melting limit.

The melting point is the temperature at which a crystal is in a state of solid-liquid coexistence during the transition from a solid state to a liquid state. The temperature at which the opposite action takes place (i.e., from a liquid state to a solid state) is called the freezing point (also known as the freezing point), and the freezing point of the crystal is the same as the melting point.

Question 4: What does melting point mean It refers to the temperature point at which a liquid reacts with a certain substance, such as salt in water, and the water temperature reaches 80 degrees The salt begins to melt, then 80 degrees is the melting point.

Question 5: What is melting point??? I guess you're a junior high school student.

The melting point is the physical property of the substance, and only crystals have a fixed melting point, and noncrystals do not have a fixed melting point, such as paraffin, glass, hypo, etc.

The substance with the highest melting point is hafnium alloy.

At present, the substance with the highest melting point on Earth is hafnium alloy - pentacarbide tetratantalum hafnium compound, with a melting point of up to 4215 degrees Celsius. However, it is a pity that the surface temperature of the sun is 5,500 degrees Celsius, which is more than 1,000 degrees Celsius short. And the simple temperature of more than 1,000 degrees Celsius is enough to melt most of the stones.

The tungsten filament inside the light bulb can withstand a high temperature of 3415, and the tantalum hafnium alloy with the highest artificial melting point needs to reach a high temperature of more than 4200 to melt, but the temperature of the sun's surface is as high as 5600, which can still melt them or even vaporize them.

If it is extended further in, the temperature of the core of the sun can reach 15 million degrees Celsius, and it is no exaggeration to say that even if humans pass through the surface and enter the core, they will become the raw material for nuclear fusion under strong pressure and extremely high temperatures.

The metals with the highest and lowest melting points are:

There is a metal called cesium, which is silvery-white, discovered in 1860, and has the lowest melting point except for mercury. Of all the pure metals, tungsten has the highest melting point.

In 1783, two Spaniards, Juan Joseph and Faust de Luya, discovered that the melting point of tungsten was 3417 10. The substances that are most resistant to high temperatures are carbide (carbide (HFG) of tantalum (and hafnium). The melting points of these two materials are 4010 75 and 3960 20, respectively.

The melting point of a substance is related to its crystal structure. Generally: atomic crystals, ionic crystals, metal crystals, and molecular crystals. Such as: crystalline silicon, sodium chloride, magnesium, dioxide, carbon. But it should be noted:

1) It is also an atomic crystal, in which the shorter the bond length of the covalent bond, the stronger the bond energy, and the higher the melting point, such as: diamond, silicon carbide (emery), crystalline silicon.

2) The same is an ionic crystal, in which the smaller the ionic radius and the more ionic charge, the stronger the interaction between the anion and ion, and the higher the melting point of the crystal, such as: magnesium oxide, sodium chloride, potassium chloride.

3) The smaller the radius of the cation, the more charge the ion has, the stronger the metal bond, and the higher the melting point. Such as: sodium, potassium, rubidium, aluminum, magnesium, sodium.

4) It is also a molecular crystal, due to the influence of intermolecular forces. The intermolecular forces are related to the polarity of the molecule and the relative molecular mass. Therefore, the melting point of the molecular crystal formed by polar molecules is higher than that of the molecular crystal formed by non-polar molecules.

Such as: SO2 CO2, HCl CH4.

The larger the relative molecular mass, the stronger the intermolecular force, and the higher the melting point, such as: Cl2 O2 N2 H2.

Molecular crystals with similar composition and structure, which are formed by polar molecules, will also have an impact on the melting point if there are hydrogen bonds between the molecules. Such as: Hi HF, HBR, HCL.

As of 2019, the substance known to have the highest melting point is a compound of hafnium: pentacarbide tetratantalum hafnium (TA HFC) with a melting point of 4215. Hafnium is a metallic element with the symbol HF, atomic number 72, and atomic weight.

Elemental is a shiny, silvery-gray transition metal.

Hafnium has 6 naturally occurring stable isotopes: hafnium. Hafnium does not interact with dilute hydrochloric acid, dilute sulfuric acid and strong alkaline solutions, but it is soluble in hydrofluoric acid and aqua regia. The name of the element is the Latin name of the city of Copenhagen.

In 1925, the Swedish chemist Hevexi and the Dutch physicist Koster used the method of fluorine-containing salt classification crystallization to obtain pure hafnium salt, and reduced it with sodium metal to obtain pure metal hafnium. The content of hafnium in the earth's crust is that it is often associated with zirconium in nature.

Melting point refers to the temperature at which the solid and liquid states of a pure substance are in equilibrium at a certain pressure. In layman's terms, the melting point is the temperature at which a solid transforms its state of matter from a solid state to a liquid state. The temperature at which the liquid state changes from a solid state is called the freezing point.

Unlike the boiling point, the melting point is less affected by pressure, whereas most of the time the melting point of an object is equal to the freezing point. The melting point is for crystals, and the melting point of crystals from high to low is: atomic crystals, ionic crystals, metal crystals, and molecular crystals.

The temperature at which the crystal melts is called the melting point.