Blue Sky

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Why is the sky blue?

You already had asked yourself why is the sky blue? Well the answer is in the a physical phenomenon of the light is simply the result of the interaction of sunlight with the atmosphere. An amount(una cantidad) of moisture(humedad), relatively small, accompanied by dust and ash is sufficient to cause the multiple manifestations of sky color. When there are extreme weather conditions may occur chromatic atmospheric phenomena such as the Rainbow Circles Ulloa, the Crowns solar and lunar halos, False False Suns and Moons and more "rare" (Mirages, Rayo Verde Holy Light, Aurora Polar Fires of San Telmo ...), optical phenomena that are totally explainable. Here we shall consider just the most common optical phenomenon that is the color of the sky in its many possible manifestations. The secret of blue sky is related to the composition of sunlight, formed by the different colors of the rainbow-and moisture from the atmosphere. (The Sun is in charge of procuring air humidity. With heat, water causes part of the Earth's surface evaporates. The invisible but incessant stream, moisture is directed into the sky from oceans, seas, lakes and rivers, from the soil, plants and the bodies of animals and man).
if you delve(profundisar) a little more, the explanation is more complex. Light is an electromagnetic wave and the fundamental pieces of matter in its most common on Earth, are atoms. If the particles in the atmosphere, have a size equal to or less than the wave(onda) of incident light (single atoms or small molecules), the wave transfers its energy from nuclear crust (corteza)begins to oscillate, so that a first effect of the interaction of light with small particles from the air is that the incident radiation is weakened by ceding part of its energy, what happens when sunlight passes through the atmosphere. The spread(difición) will be higher therefore to shorter waves: As a result, we reach the same conclusion, violet light is the most common and least red.
The net result is that some of the light coming from the Sun in a straight line(linea recta) to reach the atmosphere diffuses in all directions and fills the sky. The color of the sky should be violet as this is the shortest wavelength, but not, for two main reasons: because sunlight contains more violet and blue light because the human eye (which ultimately is the captures the images, although the brain interprets ") is more sensitive to light blue to violet.

so that is the answer