Why do snowflakes only have 1 shape, and why do snowflakes usually have a fixed shape?

Why is the basic form of a snowflake hexagonal sheet and columnar?

This is related to the crystallization habit of water vapor condensation crystallization. Snowflakes crystallized by water vapor condensation and ice frozen by natural water belong to the hexagonal crystal system. In museums, we are easily attracted by the pure and transparent crystal.

Crystals, like ice crystals, are hexagonal crystal systems, but crystals are crystals of silicon dioxide (SiO2) and ice crystals are crystals of water (H2O).

The hexagonal crystal system has four crystalline axes, of which three auxiliary axes intersect each other at an angle of 60o on a base plane, and the fourth axis (the main crystal axis) is perpendicular to the base plane formed by the three auxiliary axes. The most typical representative of the hexagonal crystal system is a regular hexahedral cylinder in geometry. When water vapor crystallization, if the main crystal axis develops slower than the other three auxiliary axes and is very short, then the crystal forms a sheet; If the main crystal axis develops quickly and extends very long, then the crystal forms a columnar shape.

The reason why snowflakes are generally hexagonal is because the crystal grows much slower along the main axis than along the three secondary axes.

A? As the saying goes, no two snowflakes are the same.

There are many shapes of snowflakes, but there is only one that appears on TV.

Learn from the scumbag fake teacher and teach you to increase your knowledge.

There is a saying that "the world can't find two identical fallen leaves", and there is also another famous saying "the world can't find the same two snowflakes", which refers to the variety of snowflake shapes, and according to the snowflakes collected by everyone, it is found that there are more than 4,000 different snowflake shapes in the world.

How can there be so many shapes pinched?

We know that snowflakes are ice, and ice is the crystallization of water, and the shape of the crystals is determined by the molecular formulas that make it up. Snowflakes come in many shapes and are very beautiful. Snowflakes are mostly hexagonal in shape, and this is due to the fact that snowflakes belong to the hexagonal crystal system.

Snowflakes among the clouds"In vitro embryos"The key of the Xiaoice crystal has two shapes. One is hexagonal, long and thin, called column crystal, but sometimes its two sides are pointed, like a needle, called needle crystal. The other kind is a hexagonal sheet, like a sheet cut from a hexagonal pen, called a flake.

In the same way, the structure of the water molecule determines the basic shape of the snowflake: the hexagon.

We know that when the temperature decreases, the particles in the chemical substance also feel like cold, gradually pulling you to each other to heat, and the same is true for water molecules, a water molecule is composed of an oxygen molecule and two hydrogen atoms, and the angle of this outstretched hydrogen atom "arm" is 104°28, this perspective determines that when the water molecules are holding hands, the most reliable fixed structure is a hexagonal (alias: hexagonal crystal system).

Subsequently, the water molecules will continue to widen and expand according to this hexagon, as they do below:

From a more macroeconomic point of view, it is the following appearance: from the hexagon, the fractal, the repetition, and finally the most beautiful flower in the world: the snowflake.

That's why you see that the snowflakes are all hexagonal.

Speaking of which, the problem becomes, isn't it true that all snowflakes should look the same, as I say?

Snowflakes tend to have so many shapes, and it also depends on the temperature and humidity of the environment. If there is a lot of water vapor around the ice crystal, and the six corners rise rapidly, a star shape will be produced: if there is very little water vapor, and the six corners will not rise as fast as the two bottom edges, a column shape will be produced

If the water vapor is moderate, lumpy snowflakes will be produced.

Snowflakes are crystallized by water vapor condensation and belong to the hexagonal crystal system. However, there can only be 1, 2, 3, 4 and 6 axes of symmetry in the crystal structure and there can only be 14 forms of spatial lattice, and snowflakes have regular shapes.

Because the snowflakes rub against the air during the time they form and fall, the shape of the edges is different.

Because this is a natural phenomenon, the color and shape of snowflakes are generally fixed, as this is the shape formed by water vapor in the air.

Related to the speed of water vapor condensation crystallization, snowflakes are changed by the increase of Xiaoice crystals, and the ice molecules are hexagonal for the most, so the formation of snowflakes is mostly hexagonal. The variety of snowflake shapes is closely related to the water vapor conditions at the time of its formation. Snowflakes are formed by the condensation of water vapor in the air.

In general, water vapor condenses into water before it freezes. Snowflakes are formed directly from the condensation of water vapor.

Snowflakes rely on the dust particles in the air below the stratosphere that cannot be seen by the naked eye as crystal nuclei, and the water molecules of water vapor condense layer after layer around it under the action of cold air, and the crystal nucleus grows outward from **. It takes about 5 minutes for a snow crystal to form, during which time the air flow in the snowmaking environment is constantly fluctuating, but the water vapor must remain the same amount around the crystal nucleus.

1. The conditions for the formation of snowflakes are very different, the shape of snowflakes is mainly related to the temperature of the formation of snowflakes, when the temperature is -3 to -8, the snowflakes become needle-shaped; At temperatures from -8 to -25, the snowflakes are flakes or fan-shaped; No matter how cold it gets, the snowflakes become jade columns, so snowflakes come in a variety of shapes.

2. Snowflake, also known as silver millet, jade dragon, jade dust, is a crystal, is the water vapor in the sky through the condensation of solid precipitation, the structure changes with the change of temperature, mostly hexagonal, like flowers. Snowflakes are mostly hexagonal in shape, and this is because snowflakes belong to the hexagonal crystal system. The Xiaoice crystals of the "embryo" of snowflakes in the clouds are mainly of two shapes.

One is hexagonal, long and thin, called column crystal, but sometimes its ends are pointed, like a needle, called needle crystal. The other is in the form of hexagonal flakes, like the flakes cut from a hexagonal pencil, called flakes.