Are there the same snowflakes?
Snowflakes are crystals of water. In the liquid and gaseous state, water molecules freely move past each other, without forming strong intermolecular bonds. When the temperature drops - for example, if the cloud rises to the upper atmosphere - the molecules lose kinetic energy, their movement becomes slower, and bonds form between the molecules. The shape and configuration of the electron cloud around the atoms in the water molecules is such that upon cooling they line up in regular hexagons. With this figure, every snowflake begins.
But further on, crystal growth is controlled only by chance. Depending on the humidity, pressure, and other conditions accompanying the growth of snowflakes, new layers of molecules overlap each other, forming an intricate shape of snowflakes.
In his laboratory, Professor Libbrecht grows tiny hexagonal crystals of water, and then puts them on a chilled glass plate and removes their growth on the camera. And here is the conclusion: under laboratory conditions, at constant temperature and pressure, the appearance on the plate of two absolutely identical snowflakes is a quite common phenomenon. But in nature, this is not so: the conditions are variable, and the probability that someday the fluctuations in temperature, pressure and mechanical stress coincide in order to give birth to twin snowflakes tend to zero.