• @[email protected]
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    948 months ago

    It’s the cooling of silica (really, any material) that makes it a glass, and even then, transparency in the visual wavelength is not automatically certain.

    • teft
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      748 months ago

      Case in point, obsidian.

      • @[email protected]
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        608 months ago

        Good example. Obsidian is apparently 70% silica. Iron is apparently what makes it black in color. If it’s thin enough, it is translucent.

        If you cool pure silica slowly enough, with impurities to cause seeding, you will get tons of crystals, not a single glass, that won’t be transparent.

  • 7heo
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    8 months ago

    3090 degrees is above its boiling point (which is 2950 degrees).

    So it doesn’t become “clear”, it literally vaporises.

    • @[email protected]
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      8 months ago

      You are talking Celsius while the meme is likely referring to F (you can tell because Obama)

      • Spzi
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        18 months ago

        This ambiguity is what I had in mind when I read “let me be clear”. Though now I get it.

  • @Noodle07
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    358 months ago

    Glassblowers: thanks Obama

  • @_sideffect
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    218 months ago

    I wonder how they figured that out

    Did molten lava touch sand and then they were like 😳

    • @[email protected]
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      8 months ago

      Maybe tektites? Natural glass formed when lightning meteorites strikes sand. I only remember the name because they share it with the jumpy spiders from Zelda

    • @jaybone
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      58 months ago

      It’s like minecraft.

    • @Olhonestjim
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      38 months ago

      If you spent your days cooking with fire, and your nights watching it and warming yourself, you’d definitely start tossing anything you could find into it just to see what would happen. People did this every day and night for eons.

    • teft
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      8 months ago

      deleted by creator

    • @[email protected]
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      8 months ago

      I think people just experimented a lot. Try enough random things, you’re bound to come across cool chemistry every once in a while. If they figured out how to make really hot fire, that opens the path to “let’s try making various things really hot to see what happens”.

      Of course, I know basically nothing about [pre]history or human development so I could be way off

    • @robocall
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      18 months ago

      More like an orangey white like an incandescent bulb, maybe.