The reason why the sea is blue is that the reflection and absorption between the light and the sea water, the light of other colors, because of the great transmission, has been absorbed by the sea water, only blue light can reflect to the eyes, so the water looks blue.
When many people go to the beach to play, they find that the sea water is blue, they become curious, want to know why the sea is blue and not other colors, let’s go to understand together.
Sunlight is composed of red, orange, yellow, green, blue, blue, and purple. The wavelength of the seven-color light varies from red light to purple light. The wavelength changes from long to short, and the wave is long. The red light, orange light, and yellow light have strong penetration ability and are most easily absorbed by water molecules. Blue and violet light with shorter wavelengths have weak penetration ability and are most easily scattered and reflected when they encounter pure seawater. Because people’s eyes are not sensitive to purple light, they often turn a blind eye to it, but are more sensitive to blue light. Thus, the ocean as we see it takes on the color of azure or deep blue. If you play a bucket of seawater in the bowl, then the seawater and ordinary water, is colorless and transparent.
In fact, the sea water looks not all blue, but red, yellow, white, black and so on. Because the color of sea water is affected not only by the above factors, but also by the suspended substances in se
China’s yellow sea, and looked a yellow green, this is because much of the ancient Yellow River with sediment will be the water of the sea “stained”.
The Red Sea between Asia and Africa, because of its high water temperature, the sea grows a species of algae, which is reddish-brown after mass death, dyeing the sea red (why is the Red Sea red).The Red Sea got its name from this.
The Black Sea, due to the injection of Danube, Don, Dnieper and other rivers, the surface density is very small, the depth is affected by the Mediterranean high salinity seawater, the density is very large. Thus, the upper layer density is small, the lower layer density is large, and the difference is large, the upper and lower layer water is difficult to exchange. There is only a narrow and shallow Türkiye Strait between the Black Sea and the Mediterranean Sea, which makes it difficult to exchange seawater between them. In this way, the lower sea water of the Black Sea has been in an anoxic environment for a long time, and the pollutants secreted by organisms and various animals and plants in the upper sea water sink to the depths after death, rotting and smelling, and a large amount of muddy water makes the sea water black.