Hardness
		n Hardness measures the capacity of  a material to resist deformation n Brinell:  A hardened steel ball is pressed into the surface of a test specimen n the resulting diameter of the impression determines the Brinell Hardness Number (BHN) n by the way Sut ~= 500*BHN n Rockwell:  The depth of the indentation is measured n On both Rockwell and Brinell numbers, be sure and note testing material and testing standards, i.e., diameter of ball and material being tested