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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You can see through gold in a solid state. The original visors on NASA space helmets were coated in gold foil. Gold is so malleable you can press it thin enough to where you can still see through it but it reflects a lot of light. I think the newer visors use vapor deposition but still use gold.
More to read here: https://spinoff.nasa.gov/spinoff1997/hm2.html
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