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What is Photochemistry definition/concept

Color is present in everything around us and its understanding is integrated into a discipline: photochemistry. As its name implies, this discipline focuses on the chemical transformations that occur in organisms as a consequence of the effect of light. 

The prefix photo comes from photos in Greek and means more precisely light.

Newton’s experiment on the nature of color meant the definitive advance of photochemistry

In antiquity, some sages tried to explain the phenomenon of the rainbow or the appearance of colors in soap bubbles when the light is intense. However, it was Isaac Newton who definitively understood the mechanisms of nature that make it possible to distinguish colors.

Newton placed a prism in a beam of light and thus produced a spectrum. With that he deduced that the prism was what distributed the colors. This experiment established the first step in understanding how light intervenes in color formation. Currently, it is understood that the shorter wavelengths are those that reflect with greater intensity and the longer those that reflect less. Photochemistry

Color generation through the use of lights is known as trichromy. The principles of trichromy are found in television screen technology

The knowledge of trichromia has been crucial to understanding how the specialized cells of the human eye (cones and rods) capture light and allow us to see reality in color.

In the process of photosynthesis performed by plants there is the so-called photochemical step or light phase. Light waves focus on plant pigments to produce chlorophyll.

The principles of photochemistry are also applied to medicine, as they allow us to visualize the body’s processes on very small scales.

photochemical smog

This phenomenon is a form of contamination of the atmosphere . Automobiles and some industries generate gases such as nitrogen monoxide. When released into the air, it produces nitrogen dioxide, which is broken down by the effect of sunlight and eventually forms ozone. When this happens the sky appears with a reddish color and a thick appearance.

It is called photochemical smog because the polluting gases in the atmosphere react to sunlight and in turn produce other contaminating effects, such as tropospheric ozone.

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