Magnesium is a mineral found in a wide variety of foods. Inside of our bodies we mostly find magnesium in our bones (60-65%), in our muscles (25%) and in other cell types and body fluids. Magnesium cannot be made in our body like all minerals, which is why we need to take it in through magnesium-rich foods.
The Brinell hardness number (HB) is the load divided by the surface area of the indentation. The diameter of the impression is measured with a microscope with a superimposed scale. The Brinell Hardness Number is computed from the equation: P is the applied load of 3000, 1500, or 500kg.
A Comparable Scale to Rockwell Hardness. The Rockwell scale has been compared to the Brinell scale. The Brinell scale was developed by Swedish engineer Johann A. Brinell in 1910. This scale operates as follows. A load is applied to a hardened steel ball that sits on a flat surface of the metal waiting to be evaluated.