Hardness

: For the mathematical concept of the difficulty of proving a conjecture, solving an equation, etc., see computational complexity theory.

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In materials science, hardness is the characteristic of a solid material expressing its resistance to permanent deformation. Hardness is measured by Mohs Scale

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There are three principal operational definitions of hardness:

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• Scratch hardness
• Indentation hardness
• Rebound, dynamic or absolute hardness
Hardness: Scratch hardness ►



 

Mathematical: REDIRECT Mathematics...

Computational complexity theory: Complexity theory is part of the theory of computation dealing with the resources required during computation to solve a given problem. The most common resources are time (how many steps it takes to solve a problem) and space (how much memory it takes). Other resources can also be considered, such ...

Materials science: Materials science is the multidisciplinary field relating the performance and function of matter in any and all applications to its atomic, micro, and nano-structure, and vice versa. It is closely related to applied physics, chemical engineering and chemistry, biology, mechanical engineering, and el...