Why cloudy the sky is gray, and clear blue?

The Beauty of the sky repeatedly depicted by artists, described by the writers and poets, even people very far from the art, the inviting stare into this abyss, admire her, finding no words or enough emotion to Express those feelings that chafe the soul and mind. The heights is the most attractive person in any role, she is beautiful for its crystal blue surface, not less attractive and its bubbling streams of white-gray clouds, exchangeable light patches of Cirrus clouds or Cumulus lush “lambs”. And however melancholy may seem the overcast sky, enveloping in its depth, deafening and oppressive the whole mass, it also causes a storm of emotions and experiences, evoking thoughts on the particular wave.

Beauty sees the beholder

Each person differently perceives the world. For some, it is gloomy and gray, while others only see a lush, green, full of colors the planet. Vary we appreciate the heavens above our heads. If you take into account a person with normal color perception, he will see the sky as they appeared to him to consider – blue, grey, pinkish at sunset, smoky-gray in the dawn.

In fact these colours – it's only something that can pass us by our eyes and brain. Vision people the easiest way to perceive the cloudy sky is gray. In clear weather, over the heads we have the endless azure on the atmospheric dome closer to the purple hue, if you look at it from the Earth.

In this article we will find out why the sky on a cloudy day gray and what determines the saturation of this color, also know as the colors change throughout the day and year, and what affects these processes.

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Bottomless ocean in the sky

Over the territory of European countries the sky in the warm season usually hits its rich blue shade. Sometimes it is possible to say that it is blue. However, given what is happening above our heads, at least one day and to carefully observe natural processes, we can see the gradation of color that changes a lot since sunrise and until it fully sits.

The Summer sky seems so clean and visually high due to low humidity, lack of a large number of clouds, which, accumulating the water, gradually falling closer to the ground. In clear weather our view looks not even hundreds of meters forward, and at a distance equal to 1-1,5 km. So we perceive the sky so high and bright – the lack of clutter in the paths of light rays in the atmosphere contributes to the fact that they are not fractured, but the eyes perceive the color blue.

Why the sky changes color

This change is described by science, though not as picturesque as writers, and is called diffuse radiation of the sky. Speaking in plain and accessible language for the reader, to explain the processes of Svetovrachane heaven. The light that is radiated by the sun passes through air layer around the Earth, it dispels it. Easier this process occurs with waves of short length. During the maximum elevation of a celestial object above our planet, in a point located out of its direction, will experience the most vivid and rich blue color.

But when the sun sets or rises, its rays are tangent to the surface of the Earth, the light radiated by them, you need to go a long way, and therefore russiausa in the air, they are much more than a day. As a result the person sees in the morning and evening sky in pink and red tones. More likely this phenomenon is seen when over us the overcast sky. The clouds and the clouds become very bright, the glow of the setting sun paints them in stunning crimson color.

Lightning steel

But what is a cloudy sky? Why it become like that? This phenomenon is one of the parts of the water cycle in nature. Climbing up in the form of steam, water particles fall into our atmosphere at a lower temperature. Accumulate and cools at high altitude, they are joined together into drops. In that moment, when these particles are still very small, and appear to our eyes beautiful white Cumulus clouds. However, the greater are the drops, the more the grey clouds.

Sometimes looking at the sky on which float these huge “lambs”, you can see that one of them is gray, and others do acquire a steel storm shade. This transformation is due to the fact that the drops in the clouds are of different size and shape, so the light they refract differently. When the sky is completely cloudy, it is entirely painted in mouse grey tones, we end up with only white light.

The Vast expanse of smoky

There Are days when the gray sky is not a single lumen. This happens when the concentration of clouds and clouds are very high, they envelop all of the visual space in the sky. Sometimes they are perceived as huge oppressive mass, ready to fall on his head. And most typical this phenomenon is demonstrated in autumn and winter, when the temperature is low but humidity is high and Vice versa at the level of 80-90 %.

In those days, the clouds are very much close tothe earth's surface, they are only a hundred or so meters from her. Description cloudy sky often has a melancholic and depressive touch, and it is connected, most likely, it is those feelings that arise when you feel alone with this grim Hulk, ready to tumble and fall on you the rain and cold.

But everything could have been different…

What tones played by the sky depends on light intensity and wavelengths reaching the planet, so in the winter even on clear days it is gray-blue. But the closer spring and the higher the position of the sun, the brighter the blue sky, especially on days when the haze dissipates in the upper layers of the atmosphere distorting the light.

Scientists have found that on other planets the sky at all may not be familiar to us blue and grey colors, on Mars, for example, it rose even in the midst of daylight.