Material

Source: Wikipedia, the free encyclopedia.
polymers
).

A material is a

biological function. Materials science
is the study of materials, their properties and their applications.

Raw materials can be processed in different ways to influence their properties, by purification, shaping or the introduction of other materials. New materials can be produced from raw materials by synthesis.

In

industry, materials are inputs to manufacturing processes to produce products or more complex materials.[1]

Historical elements

Materials chart the history of humanity. The system of the three prehistoric ages (Stone Age, Bronze Age, Iron Age) were succeeded by historical ages: steel age in the 19th century, polymer age in the middle of the following century (plastic age) and silicon age in the second half of the 20th century.[2]

Classification by use

Materials can be broadly categorized in terms of their use, for example:

  • Building materials are used for construction
  • Building insulation materials
    are used to retain heat within buildings
  • Refractory materials
    are used for high-temperature applications
  • Nuclear materials
    are used for nuclear power and weapons
  • Aerospace materials are used in aircraft and other aerospace applications
  • Biomaterials are used for applications interacting with living systems

Material selection is a process to determine which material should be used for a given application.

Classification by structure

The relevant structure of materials has a different length scale depending on the material. The structure and composition of a material can be determined by microscopy or spectroscopy.

Microstructure

In engineering, materials can be categorised according to their microscopic structure:[3]: 15–17 

Larger-scale structure

A

size, orientation and arrangement to achieve the desired property.[4]

In

textiles, the chemical structure is less relevant to immediately observable properties
than larger-scale material features: the holes in foams, and the weave in textiles.

Classification by properties

Materials can be compared and classified by their large-scale physical properties.

Mechanical properties

Mechanical properties determine how a material responds to applied

forces
.

Examples include:

Thermal properties

Materials may degrade or undergo changes of properties at different temperatures. Thermal properties also include the material's

thermal conductivity and heat capacity, relating to the transfer and storage of thermal energy
by the material.

Other properties

Materials can be compared and categorized by any quantitative measure of their behavior under various conditions. Notable additional properties include the optical, electrical, and magnetic behavior of materials.[3]: 5–7 

See also

References

  1. ^ "Definition of MATERIAL". Merriam-Webster. 2023-08-20. Retrieved 2023-08-29.
  2. ^ "Materials that shaped history | School of Materials Science and Engineering – UNSW Sydney". UNSW Sites. Retrieved 2023-08-29.
  3. ^ .
  4. .

External links