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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Think of it like aluminium foil. it’s metal but very easy to bend.
Stack hundreds of sheets of it and you’ll have a thick piece of aluminium which is very strong (because it’s basically solid aluminium)
Now offset the layers them slightly so you have a wedge shape and now you have something that looks like a blade i.e. a thick part on one side and a very thin part on the other.
The thin part is basically just a few sheets of aluminium, and you know how easy it is to bend a few sheets right? This is exactly what happens at the microscopic level
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