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I made these pictures in the Forest of Finges (the one I talked about in earlier posts). There was hole of water and ice everywhere on the ground, then, I remarked that there was beautiful differents natural structures. I decide today to share it with your. I hope you will appreciate. Maybe some TE's members had never had the chance to see these in real...

Crystals of ice :
Water can be in three different states: liquid, solid or gas. One can obtain crystals in two different ways: while passing from the liquid state in a solid state, one obtains ice then, or while passing from the gas state (as in the clouds) in a solid state, one obtains this time snow; In both cases, one needs germs of cristalisation, like dust, around whose the water molecules will be able to incorporate itself; They thus will arrange the ones around the others in order to form the most stable possible structure. In the most current structure, each molecule is related to four neighbors by hydrogen bonds. There is thus more space between the molecules than in the liquid state, this is why the ice is less dense than water and the icebergs float. The water molecules are ordered in the crystal according to a hexagonal reason, this is why the flakes have a hexagonal general form. But the possibilities are infinite. Ukichiro Nakaya (1954) however succeeded in classifying the crystals in seven categories; plates, stars, columns, needles, dendrites, columns with cap and crystals irregular. The size and the shape of the crystal depend on the conditions of moisture, the temperature and the time during which it will remain in the cloud. For example the plates are formed at a temperature lower than stars. At the beginning of the formation of the crystal the form is simple, it evolves/moves according to the place where water are fixed on the crystal. As they rather tend to be fixed on the angles, one observes the "lace" shapes, noncompact.

JasPahal ha contrassegnato questa nota come utile

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Additional Photos by Trabelsi Isabelle (ilouy) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 306 W: 212 N: 173] (3370)
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