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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Bread dough is so soft you can push a finger through a block of it. Aluminum is hard enough to make some tools out of. And yet, if you tape a piece of aluminum foil to the edge of a counter so that it sticks out horizontally and then try to rest a one-pound chunk of bread dough on top of the overhang, the foil will bend and drop the dough on the floor. It’s not unusual at all for a softer material to damage a harder one. It’s more likely if the piece of soft material is bigger or thicker than the piece of hard material, if the soft material gets to attack the hard material repeatedly, and if either of them is moving fast or is pushed very hard.
The edge of a razor blade is much thinner than the hairs it’s cutting through, and it takes many hairs to damage the blade noticeably. And in proportion to the strength of the hairs and blade edge, the force your hand applies to the razor is big enough to not be insignificant.
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