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August 25, 2016 23:11

Why is snow white ?

question that you can see the title of the topic, often ask the children (the last really love to ask about a variety of things).That's just the parents do not always know the answer, but at school they probably together with the teacher addressed the issue.However, our site will help you find the answer to it.

First we need to find out, what is snow and what it actually is?So, in fact in front of us a form of precipitation that is formed by adding the smallest drops of water to the dust particles in the air.Subsequently, they are frozen and, falling down, start to increase in size due to the condensation of moisture from the air.In this way, and there are snowflakes six-pointed crystals.What's interesting is that between the beams of the crystal due to the structure of water molecules, only two angles - 60 and 120 degrees, respectively.Initially, the crystal has the shape of a regular hexagon, which is then attracted to moisture, due to which a variety of forms formed snowflakes.The last may be pa

rtly in the melt while traveling in the atmosphere, taking one form or another.

As for the size of snowflakes, he, in most cases, depends solely on the temperature.For example, in a warmer become larger snowflakes and frost, on the contrary, reduced.

Pro color

If you look at the snow with the naked eye, it seems that it is literally pure white.But actually a group acquires only at the moment when the sun rays fall on it.Although everything is not so clear - if properly look closely, this type of precipitation has a light gray-blue tint.And if the street is overcast, the snow will be rather gray or bluish rather than a bright white.Why?

whole point lies in the sun.Think of the curriculum - when some thing completely absorbs sunlight, it seems black.Quite a different matter when the subject reflects the sun's rays - in this case, we see it with white.The same goes for snow.

Now you probably matured another question - if you take a single snowflake, then it would be clear, but the snow still takes a lighter shade.What is the reason for this phenomenon?Quite simply - the crystals fall to the ground randomly, forming snow.And if one is able to pass through a Snowflake themselves a ray of sunshine, the set of crystals can not do so, the beam is simply not making its way through them and getting to the top layer, corny refracted and reflected.

By the way, an interesting point.If the sun's light was not white, but, say, red or green, and the snow would have been exactly the same shade.This effect can be seen, for example, at sunset, when the sun's rays become a characteristic pink color, resulting in snowfall we see also in pink.

Other interesting facts

  • Snow - an indispensable attribute of winter.Of course, you can say that in many places in the winter season is not observed precipitation, however, a steady snow cover - one of the main conditions of winter climate.This fully felt by the inhabitants of most of our state.For example, in areas where the climate is harsh (such include, for example, Chukotka), snow can fall nearly in September and thus remained stable almost until the middle of next summer.In the middle zone where the climate is milder, but even here the first snowfall is possible in October, but in March and April, they completely disappear.But in the southern part of the Russian Federation and the snow does not fall, except during the harsh winters.
  • Snow can melt not only at zero, but even sub-zero temperatures.This is due to the fact that the transition from solid to gaseous state without going through the liquid phase.This process is called sublimation and he comes under the influence of sunlight.
  • Snow can be found on other planets.For example, it is on Mars, where there is available to us as the usual snow cover and snow of solid carbon dioxide, which we know as "dry ice".Similar rainfall also falls on Titan, Saturn's moon.But the most snowfall can be observed on Neptune's moon - Triton, which is abundantly covered with snow, making it very bright compared to other solar system objects (it reflects almost all of the sunlight).True, he does cover a pinkish hue, due to the presence therein of nitrogen and methane complex compounds.
  • Finally, last interesting fact today - the diameter of the large snowflakes around 38 centimeters.This figure has been officially registered.Snowflake it fell to the ground about 140 years ago in one of the American states.Moreover, her picture can be found in one of the local newspapers.If we talk about the usual snowflakes, they are much smaller in size - on average, only a few millimeters