6/4/2023 0 Comments Dust particles![]() ![]() To reach you, the scattered blue light must pass through more air. Since you see the blue light from everywhere overhead, the sky looks blue.Īs you look closer to the horizon, the sky appears much paler in color. Whichever direction you look, some of this scattered blue light reaches you. The absorbed blue light is then radiated in different directions and it gets scattered all around the sky. However, much of the shorter wavelength light is absorbed by the dust and gas molecules. Little of the red, orange and yellow light is affected by the air. As light moves through the atmosphere, most of the longer wavelengths pass straight through. The blue color of the sky is due to Rayleigh Scattering. However, it is not generally known that if there was absolutely no dust in the air the path of the sunbeam would be totally black and invisible. Scattering Sun-RaysĮveryone has seen the floating dust in a sunbeam when sunshine enters a partially darkened room. ![]() Hence, if there were no dust in the air, escaping steam would remain invisible there would be no clouds in the sky and the vapor in the atmosphere, constantly accumulating through evaporation from seas and oceans and from the earth’s surface, would have to find some other means of returning to its source. Hence the fact that the steam issuing from the safety-valve or the chimney of a locomotive forms a dense white cloud shows that the air is really full of dust particles, most of which are microscopic but none the less serving as centers of condensation for the vapor. The density of the cloud is proportionate to the number of particles present. Their number of experiments showed that the mere cooling of vapor in the air will not condense it into mist clouds or rain unless particles of solid matter are present to form nuclei upon which condensation can begin. This theory was initially discovered in France by Coulier and Mascart, but more thoroughly worked out by Mr. are also formed due to the presence of dust particles in the atmosphere. The absence of dust particles can delay the rain. These drops fall on to the earth as rains. The water vapor in the clouds condenses on dust particles in the form of water-drops. The biggest utility of dust particles is that they help in the formation of rains. Due to the presence of dust in the higher atmosphere, we owe the formation of mists, clouds, and gentle beneficial rains, instead of waterspouts and destructive torrents. ![]()
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