The wavelengths that excite the hydrogen-oxygen
bonds in water exist mainly in the infrared and in
the ultraviolet. We just happen not to be able to
see those frequencies.
Why is water not white
Because it is a substance that does not
have any changes in its properties all of the way
through it (e.g. index of refraction,etc.).
Individual quartz sand grains are clear, but
because when you look at sand, you see light
scattered through them, it looks white. A solid
block of the same material, like a glass window,
is clear.Likewise, a cloud, which is made up of
water droplets,scatters light off of the surface
of the droplets, and appears white (or gray, if
you are looking through it).
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