Why is ocean's colour is blue?

Question

Why is ocean's colour is blue?

Answer 1

Because the sky is blue.It will get reflected on ocean...

Answer 2

well,

people may say that blue algae gives water blue hue but here in case of whole sea it is due to lots of oxygen.

when light on this water due to oxygen it cannot absorb blue pigment of light &thus reflects as its colour.

thankyou.

Answer 3

Many people assume that the sea is blue, because it reflects the colour of the sky.  This is true to a certain extent; but applies to the surface of the sea only (which can be greyish on an overcast day.  But even on a heavily overcast day, the sea wil still be blue when looked at in depth.

The sea is blue for the same reason that the sky is blue:

In the first place, the sky is blue because the molecules in the atmosphere scatrter the blue part of the spectrum, and the red and yellow parts of the spectrum tend to pass straight through.  What happens is that the blue light is absorbed by the molecules in the air; then 're-emitted'.  The re-emitted light may get absorbed and emitted many times over before it reaches us.  To us looking from the ground, the blue light seems to be coming from everywhere (this is called 'Rayleigh cattereing'); hence the sky seems blue.

The reason why the sea seems blue is similar; but a little more complicated.  The sea does reflect the blue colour of the sky (or can appear grey in overcast weather), but this only applies to the surface of the sea.  As well as reflecting the blue from the sky, the water molecules scatter the blue light in much the same way as the air molecules in the sky.  This accounts for the 'natural faint blue colour'.

In addition,  the water also absorbs more of the red and yellow wavelengths than the sky (which warm the sea), leaving the blue part of the spectrum, as well as part of the green.  This is why deep water can appear bluish-green. (The absorption of the red wavelengths can be noticed by looking at a red object under deep water.  It will appear black; because only blue light is reflected back to us.)

Eventually, at sufficient depth, even the blue light will have been absorbed or scattered away, and deep water will be black and lightless.

This scattering effect is even stronger if there are colloidal materials (very finely divided particles) in the water, such as finely divided clay particles.  These can increase the scattering effect, turning the water an intense blue (which can sometimes be seen in flooded abandoned quarries).  The scattering effect is also greater with ice; which results in the intense blue colour we see if we look down a crevasse in a glacier, or down a hole in the snow made by a ski stock..

For complete, scientific explanations of the scattering effect, look up 'blue sky' in Wikipedia.

Answer 4

Sunlight is made up of all the colors of the rainbow: red, orange, yellow, green, blue, and violet. Some of the sunlight is reflected off the surface of the water, reflecting the  color of the sky. Some of the sunlight penetrates the water and is scattered by ripples and particles in the water (this tinges the appearance of the ocean with the color of the particles). In deep water, much of the sunlight is scattered by the oxygen in the water, and this scatters more of the blue light.

Water absorbs more of the red light in sunlight; the water also enhances the scattering of blue light.

Answer 5

But I have seen ocean's colour is BLACK in the night.

If you are looking at the ocean in day time colour will be blue but in night it will be black.

Answer 6

well, i ll try to give an answer with my poor english :)

First of all, water is one of the colorless and transparent elements. However, as you may see in a white bathtube or in a pool, water can take green- blue colors by layering.

The reason of why sea (ocean) blue is having same reason with why sky blue,nevertheless, the real reason not a reflection happening from the water. Originally, such as N, O2,CO2 gases can be find both in atmosphere and sea.

The color of the see as per the water molecules abserbation and reflection features. As we called white light, the sun shine has own all the colors in itself. Sea water molecules as the sky's, is absorbing the red color and reflecting the blue. That is why, sky and sea are blue usually.

Yet, not every place at the sea surface has blue color. Somewhere, shiny blue, dark blue, green, turkuaz even red may be shown. This contrasts depend on the tempurate, deepness, livings in water, habitation and saltiness rate a bit. Also, it is related with how much sun light is absorbed in the clouds.

Sum up, the color of ocean or sea could have more than one reason such as mentioned above, however not caused by reflection of sky...

Piyuwwww, english is not easy :D

Answer 7

Because it is the colour of God Krishna