The sky under the snow are white?.

<P Align=center> </ P> World Scientific reports [tech.] News: the formation of snowflake formation of snowflakes <P> requires three conditions: the air suspension with a sufficient number of water molecules; air temperature is low enough; .also have a condensation nuclei, that is suspended in the air some of the same very small solid particles, such as sea salt, sulfuric acid, nitrogen or other chemicals particulates. .</ P> <P> When these three conditions are met, the water molecules surrounding the condensation nuclei, condensed into one very tiny little ice crystals. .With the continuous condensation of water molecules, small ice crystals also continue to "grow up", when the weight of large to small ice crystals can no longer maintain the suspension, the influence of gravity fall to the ground, it turned into a beautiful snowflake. .Single snowflake is generally not more than 2 mm in diameter, and we see the "snow goose feather", often in the landing process, many flakes of snow are bonded together the results. .</ P> <P> seen snow in fact consists of two parts - condensation nuclei, and condensation of ice around it. .The color of snow naturally determined by the two parts. .Look at the condensation nuclei, condensation nuclei are extremely small solid particles as small as the human eye is almost impossible to recognize the need to observe with high power microscope, so its color can be ignored; the other hand, we know that pure water is colorless .transparent ice crystals formed from the hydrogel of course, is colorless and transparent. .Therefore, the single color of snow is colorless and transparent. .</ P> <P> the color of snow from the sun </ P> <P> If amplification of view, each piece of colorless and transparent like a crystal clear snow hexagonal stones, it has lots of surface .Each surface is like a looking glass. .When the sun shines on the snow, the light in these small mirrors will be kept between the refraction and reflection, and finally into our eyes. .Therefore, we see the color of snow, in fact, many flakes of snow with the color of reflected sunlight. .</ P> <P> Sun is a star constantly burning, it can issue from a variety of different infrared wavelengths to gamma rays, light waves and rays of different colors, but we the human eye can only see them .visible light. .We can see through a prism, the sun's visible light in fact contains red, orange, yellow, green, green, blue, purple 7 colors. .When the 7 colors mixed after cross is white. .So we usually see the sun is white, snow is white. .</ P>.