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Water appears blue because it can absorb long wavelength light better than short wavelength light.
When light enters water, the longer wavelengths of light such as red, yellow, and orange are absorbed, and mostly blue light is reflected back.

Color of water - Wikipedia

en.wikipedia.org/wiki/Color_of_water

While relatively small quantities of water appear to be colorless, water's tint becomes a deeper blue as the thickness of the observed sample increases. The blue ...

WHY IS WATER BLUE - Dartmouth College

www.dartmouth.edu/~etrnsfer/water.htm

WHY IS WATER BLUE? Reproduced from J. Chem. Edu., 1993, 70(8), 612 · Charles L. Braun and Sergei N. Smirnov Department of Chemistry Dartmouth ...

Why does the ocean appear blue? Is it because it reflects the color ...

www.scientificamerican.com/article/why-does-the-ocean-appear/

"The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light).

What color is water? | Causes of Color - Webexhibits

www.webexhibits.org/causesofcolor/5.html

That cool, refreshing glass of water on a hot day may appear colorless, but water is actually a faint blue color. The blue color becomes visible when we look ...

Why Is the Ocean Blue? - Live Science

www.livescience.com/44205-why-is-the-ocean-blue.html

Mar 19, 2014 ... It's commonly believed that the ocean is blue because it's reflecting the ... Just how blue the water is depends on how much of it is available to ...

How Can Bodies of Water Be Different Colors? | Mental Floss

mentalfloss.com/article/50384/how-can-bodies-water-be-different-colors

Jun 17, 2013 ... Is the Caribbean water cleaner? Is the sun stronger down south? And how come it's green-blue near the shore, yet navy blue a mile off shore?

The real color of water - blue - ZME Science

www.zmescience.com/other/science-abc/the-real-color-of-water-blue/

Apr 2, 2013 ... You've seen it in deep oceans – water becomes blue. Sure, one could argue, but that's only because the water is reflecting the color of the sky.

Why is the ocean blue? Everyday Mysteries:Fun Science Facts from ...

www.loc.gov/rr/scitech/mysteries/oceanblue.html

Blue wavelengths are absorbed the least by the deep ocean water and are scattered and reflected back to the observer's eye; Particles in the water may help to ...

If Water Is Colorless, Then Why Does the Ocean Appear Blue ...

www.scienceabc.com/nature/water-is-colourless-yeah-so-why-does-sea-water-appear-blue.html

While relatively small quantities of water appear to be colorless, the slight tint of water becomes a deeper blue as the thickness of the observed sample ...