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Scientists from MIT have discovered why razor blades become
after repeated use. They did
into why razor blades lose their
. Razor blades are 50 times harder than the
they cut. Even though human hair is 50 times softer than the
of a razor blade, the hair damages the edge of the blade. Razor blades are made from
steel. They are usually coated with tougher
like hardened carbon. The MIT scientists said that each time a blade cuts a hair, the hair causes
amounts of damage. A blade usually cuts thousands of hairs in one shaving
. This means the life of a razor blade is limited and will need to be replaced
.
