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View Diary: Thank you Fishgrease and Intro to Intro Materials Science (17 comments)

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  •  By "guy" (2+ / 0-)
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    KenBee, BlackSheep1

    I am indeed a person, but not a guy. Don't worry, people would never guess I'm an engineer or scientist by looking at me.

    I'm going to define sharpness as thickness of the cutting edge. The thinner the sharper.

    Obsidian can hold a sharper edge than metal. I'm going to thumb a figure from memory: 3 nanometers. Please don't quote me.

    Obsidian is essentially glass (silicon dioxide just like your windows) and some other stuff in it from the earth.

    To prove to yourself this "sharpness" of obsidian versus surgical blade... Someone may have done this already.

    1. Acquire obsidian blade and surgical blade that are both marketed for surgical use.
    2. Mount the blades so that the electron beam is shone on the thinnest part... in a high-resolution scanning electron microscope.
    3. measure it.

    As to WHY? I would think about how the atoms are arranged in a metal and how they are arranged in a glass.

    Why hello there reality, how are you doing?

    by Future Gazer on Fri Dec 21, 2012 at 06:52:08 PM PST

    [ Parent ]

    •  "guy" is generic, with me (0+ / 0-)

      but yes, I did mean, otherwise, exactly what you've sussed.

      I saw mention of something comparative in an article about something else in Science News a bit ago, and it seemed this might be the ideal time to learn if there were in fact ways of telling definitively.

      Thank you!

      LBJ, Lady Bird, Anne Richards, Barbara Jordan, Sully Sullenberger, Ike, Drew Brees, Molly Ivins --Texas is no Bush league! -7.50,-5.59

      by BlackSheep1 on Fri Dec 21, 2012 at 08:17:40 PM PST

      [ Parent ]

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