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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The Mohs scale and other scratch hardness measures tell you about if one material will scratch another. The hairs are not scratching a razer blade, or really abrading it much at all. They cause the sharp edge to [bend and roll over](https://cdn.shopify.com/s/files/1/2111/3997/articles/Knife_Edge_-_Magnified_d18ce694-e441-4098-bfff-7f5dece60878_2048x.jpg?v=1505150624). They don’t need to be particularly strong to do this, because the edge of the blade is necessarily very thin and metals are malleable.
As has been pointed out in the replies to this they also cause parts of the blade to chip. There’s also the issue of rusting if you leave it wet.
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