Material constant

The items material constant , material characteristic , material size , material property and material # properties overlap thematically. Help me to better differentiate or merge the articles (→  instructions ) . To do this, take part in the relevant redundancy discussion . Please remove this module only after the redundancy has been completely processed and do not forget to include the relevant entry on the redundancy discussion page{{ Done | 1 = ~~~~}}to mark. Acky69 ( discussion ) 9:16 pm , Sep 22. 2015 (CEST)

As a material constant or material constant , a value is a physical quantity called the under predetermined conditions primarily on the used material , however dependent, usually no other external influences. It is therefore a substance's own quantity that assigns a constant value to each substance with regard to a certain substance property . In particular, all molar and specific intensive state variables of pure substances are also material constants at the same time, while their counterparts that are not quantitative or mass-related represent material variables.

However, contrary to their designation, material constants also depend on the size of the sample examined. In the range of a few nanometers, the material properties shift towards the atomic properties. This behavior is called the size effect . An important example of this is the increase in specific resistance in the case of very thin layers.

The density under normal conditions is a material constant , for example, as it is specific to the substance used.

Other examples:

• specific heat capacity
• specific resistance
• Temperature coefficient
• Coefficients of thermal expansion
• Normal boiling point
• Normal melting point
• Normal freezing point
• Permittivity
• permeability
• Speed ​​of Light
• Refractive index
• modulus of elasticity
• Shear modulus