eli5 How does razor blade dull on hairs when razor blades are made of steel and they are much higher on mohs scale?
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Ultimately, for the same reason that you can’t cut a block of cheese with a single sheet of aluminum foil. Razor blades are as sharp as they are because the blade edge is very very fine, meaning the edge is very thin metal. Hair is soft in relation to steel, but still resists being cut, and this resistance bends the thin edge of metal over time.
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