How Is Snow Formed?Snow
Snow is generated, when water steam is deposited in higher limits of atmosphere in temperature less than zero Centigrade degrees, and then falls to the basis. Snow is less dense than a rain which explains why the same quantity of humidity makes greater volume of snow than a rain. The quantity of water in eight units of snow is equivalent for the water sum of one unit of a rain.
Snow - the granulated material generated by sedimentation, and it is in the form of small rough particles transparent. It has a soft, open structure if it is not packed by external pressure, and forms set of snowflakes. Snowflakes - typically symmetric, hexagonally-having-form groups of ice crystals which are formed, falling and below clouds. Snowfall occurrence depends on various factors, such as a season, a site, width and a place eminence.
Many people think that snow only has been frozen a rain which falls to the basis. True process occurs in clouds when ice crystals are formed of water steam. This process name an eminence and describes the firm form of the snow formed directly from a phase of steam of water, without passing through a liquid water phase (rain).
It appears that "pure" snow is made of snowflakes which are made from 2 - 200 separate crystals of snow. Snow crystals - crystals which were generated round tiny bits of a dirt which were born in atmosphere by a wind.
The type of crystals depends on quantity of humidity and a temperature gift when they are formed. When cloud temperature at freezing or more low and clouds - the filled humidity, the form of crystals of snow. The ice form of crystals on dust particles as condenses water steam and partially thawed, crystals cling together to generate snowflakes. As snow crystals grow, they become heavier and falling to the Earth.
As snowflakes move everywhere on a cloud, it cristall's differently making unpredictable forms and the sizes. When circulation snow is very cold also, flakes are small and when it is closer to 32 degrees by Farenheit, flakes it is more.
Formation of crystalsSnow
Formation of crystals
Snow arises, when microscopic drops of water in clouds are drawn to dust particles and freeze. The crystals of ice which are not exceeding first 0,1 mm appearing thus, fall downwards and grow in result of condensation on them of a moisture from air. Known six-final forms are thus formed. Because of special structure of molecules of water corners only in 60 ° and 120 ° are possible.
At high crystals repeatedly vertically move in atmosphere, partially concealing and crystallising anew. Because of it the regularity of crystals is broken and the mixed forms are formed. Thus there is such variety that usually it is considered that there are no two identical snowflakes.
Snowflakes
White colour occurs from the prisoner in air snowflake. Light of all possible frequencies is reflected in boundary surfaces between crystals and air and dissipates. Snowflakes consist on 95 % of air that causes low density and rather slow speed of falling (0,9 km/h). The largest ever testified snowflake had diameter in 38 mm. Usually snowflakes have about 5 mm in diameter at weight of 0,004 At falling in water a snowflake creates extremely a high-pitched sound which is almost not heard for the person, but unpleasant for fishes.
History
Astronomer Johann Kepler in 1611 has published the scientific treatise «About six-coal snowflakes» in which has subjected miracles of the nature to consideration from outside to rigid geometry. The miniature «About six-coal snowflakes» is a curiosity of a science, the document theoretical and pride of its history. «Abundance of the deepest ideas, approach width by consideration of the reasons of formation of snowflakes, remarkable geometrical generalisations, boldness and wit of the stated hypotheses amaze and now» — here authoritative opinion of the historian with I.I.Shafranovskogo.