Why is sea water blue?Explain it.?

Answer 1

Because it reflects the blue sky. Why is the sky blue? Because of the wavelength of visible light emitted by the sun's energy interacting with the molecules in our atmosphere. Google "spectroscopy."

Answer 2

There are two reasons for the color of the sea; both of them contribute to the answer.


A. The sea reflects the sky.
You have probably noticed that the sea is not very blue-looking when the sky is overcast. Water reflects and scatters the light that strikes it; this is shown by the fact that you can see your reflection in puddles. When the sky is brilliant blue, the sea is also, because it reflects the blue of the sky. A good answer to why the sky is blue has already been posted at MADSci.

B. The sea refracts light just as the sky does.
Blue light is more easily bent, or refracted, than red light; thus, light refracted back from the surface of the sea appears blue. Furthermore, when you are underwater the water around you appears blue because more blue light is scattered back to your eye than red light. Here are some professional shots to show what I mean.
The scattering of light by the air, or by water, is called Rayleigh scattering.



ALSO

Water is faint blue. Although water appears clear in small quanities (like a glass of water), the blue color becomes visible the more water we look through. Thus, deep lakes and seas are bluer than a shallow river.

Other factors can affect the color we see:

Particles and solutes can absorb light, as in tea or coffee. Green algae in rivers and streams often lend a blue-green color. The red sea has occasional blooms of red Trichodesmium erythraeum algae.
Particles in water can scatter light. The Colorado river is often muddy red because of suspended reddish silt in the water. Some mountain lakes and streams with finely gound rock, such as glacial flour, are tourquise. Light scattering by suspended matter is required in order that the blue light produced by water's absorption can return to the surface and be observed. Such scattering can also shift the spectrum of the emerging photons toward the green, a color often seen when water laden with suspended particles is observed.
The surface of seas and lakes often reflect blue skylight, making them appear bluer. [[[ Montana reflection.]]] The relative contribution of reflected skylight and the light scattered back from the depths is strongly dependent on observation angle.

Answer 3

Because the light emitted from the sun is equal amounts red, green and blue as it enters the atmosphere. The light with the shortest wavelength is blue and when it comes through the atmosphere it bends (refracts I believe is the correct word) the easiest so that blue is the light we see. The ocean water reflects the sky. When the sun sets we can see the red refract.

Answer 4

Not all sea water is blue. Water of the Gulf Stream, off the eastern coast of the United States, is a deep blue, but water of a similar current off Japan is so dark that it has been named Kuroshio (Black Stream). In other areas water may be various shades of green, brown, or brownish-red.

The sea is blue for the same reason that the sky is blue. The blue of the sea is caused by scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wave length, is scattered more effectively than light of longer wave lengths.

Although waters of the open ocean are commonly some shade of blue, especially in tropical or subtropical regions, green water is commonly seen near coasts. This is caused by yellow pigments being mixed with blue water. Microscopic floating plants (phytoplankton) are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near shore silt or sediment in suspension can give waters a brownish hue; outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.

The color of the sea changes constantly because of clouds passing across the face of the sun or because of the angle of the sun's rays passing through the atmosphere.

Oceanographers record the color of the ocean by comparison with a series of bottles of colored water known as the Forel scale.

Answer 5

Sea water is blue because of the red green algae found in it.
As red green alga absorb the sun light and emits the other light and that is why sea water appears blue.

Answer 6

It not really--it's just that it reflects more blue light than any other color, so it appears blue to your eye. Scoop some up in a jar and it's clear (mostly) just like water everywhere. The more clear water is, meaning the deeper you can see into it, the more blue it appears. Again, it's just that the other colors are absorbed and blue (long wave length) is reflected.

Answer 7

the water is not blue it just looks blue because it reflects the color of the sky.

Answer 8

Sea water can look green or red also, due to algae and plant life.

Answer 9

it's not blue, it's clear....the blue is the reflection from the sun that you see, mixed with minerals in the H2O, and the colors around it

Answer 10

Due to reflection of light.