razor blades

[jennymac]

Can you tell me if razor blade is sharper when cold or hot, knowing that it expands when its hot does this cause the edge to dull.

[Sequin]

Theoretically, the edge of a razor blade would be 1 molecule thick. Increasing the temperature would increase the spacing between the molecules, but it would still be 1 molecule thick - ie just as sharp

[jennymac]

cheers sequin

[landie]

I don't know but if it's hot it expands so it must be sharper longer. ( or is that longer sharper?)

[neurosurgon*]

i dont think it is sharper either way, but if its hot it will have less resistance cutting, generally.

ex a hot knife through frozen, or just-out-of-the-fridge butter.