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What is the colour of water
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High School Teacher
Water by definition has no color. Pure water is transparent, a property which means that light can pass through it unimpeded. In order for a substance to have a color, it must reflect some wavelengths of light. When light is reflected off a substance back to your eyes, the reflected wavelengths enter the eyeball, hit the retina, and are interpreted into visual signals. If a substance reflects all the wavelengths that hit it, we see white. If a substance absorbs all the wavelengths, we see black, which is brain's interpretation of the absence of light. When a substance absorbs some wavelengths and reflects others, we see the colors that are reflected. For example, a blue shirt looks blue under white light because the shirt absorbs all the colors except blue, which is reflected back and enters your eyes.
Posted by pacorz on April 27, 2012 at 2:15 PM (Answer #1)
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