Bri·nell hard·ness num·ber (BHN),
(bri-nel'),a number related to the size of the permanent impression made by a ball indenter of specified size (usually 10 mm in diameter) pressed into the surface of the material under a specified load: 
where P = applied load in kg, D = diameter of the ball in mm, and d = diameter of the impression in mm.
Farlex Partner Medical Dictionary © Farlex 2012
Brinell,
Johan August, Swedish metallurgist, 1849-1925.Brinell hardness number - a number related to the size of the permanent impression made by a ball indenter of specified size pressed into the surface of the material under a specified load.
Brinell scale
Medical Eponyms © Farlex 2012
Bri·nell hard·ness num·ber
(BHN) (bri-nel hahrdnĕs nŭmbĕr)Number related to the size of the permanent impression made by a ball indenter of specified size (usually 10 mm in diameter) pressed into the surface of the material under a specified load: where P = applied load in kg, D = diameter of the ball in mm, and d = diameter of the impression in mm.
Medical Dictionary for the Dental Professions © Farlex 2012