Why can you see through H2O as both a liquid and a solid but you cannot see through something like Au (gold) in a solid state? Is this a matter of density?
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Materials tend to be transparent in certain wavelengths of light. Water’s transparent range coincides with visible light for humans. This is not a coincidence, being able to see through water is important for aquatic creatures, which is where the eye originally developed.
For example, if you go into the infrared range, many types of glass becomes opaque but silicon becomes transparent.
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