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'''{{Continuum mechanics}}
{{otheruses}}

A '''solid''' object is in the [[states of matter]] characterized by resistance to [[deformation]] and changes of [[volume]]. 
At the microscopic scale, a solid has these properties :
* The [[atom]]s or [[molecule]]s that comprise the solid are packed closely together.
* These constituent elements have fixed [[position]]s in [[space]] relative to each other. This accounts for the solid's rigidity. In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice. The spacing ,between unit cells in various directions is called its lattice parameters. The symmetry properties of the crystal are embodied in its space group. A crystal's structure and symmetry play a role in determining many of its properties, such as [[cleavage]], electronic band structure, and optical properties.
** If sufficient force is applied, either of these properties can be disrupted, causing permanent deformation.
* Because any solid has some [[thermal energy]], its atoms vibrate.  However, this movement is very small, and cannot be observed or felt under ordinary conditions.

The branch of [[physics]] that deals with solids is called '''[[solid-state physics]]''', and is a type of [[condensed matter physics]].  [[Materials science]] is primarily concerned with properties of solids such as strength and [[Phase (matter)|phase]] transformations. It overlaps strongly with solid-state physics.  [[Solid-state chemistry]] overlaps both of these fields, but is especially concerned with the synthesis of novel materials.

The lightest known solid is man-made and is called [[aerogel]].  The lightest aerogel produced has a density of 1.9 [[milligram|mg]]/cm³ or 1.9 [[kilogram|kg]]/m³ (1/530 as dense as water).

{{State of matter}}

[[Category:Solids]]

[[af:Vastestof]]
[[ar:صلب]]
[[bs:Čvrsto stanje tvari]]
[[bg:Твърдо тяло]]
[[ca:Sòlid]]
[[cs:Pevná látka]]
[[da:Fast form]]
[[de:Festkörper]]
[[et:Tahkis]]
[[el:Στερεό]]
[[es:Sólido]]
[[eo:Solido]]
[[eu:Solido]]
[[fa:جامد]]
[[fr:État solide]]
[[gl:Sólido]]
[[ko:고체]]
[[hr:Krutine]]
[[id:Padat]]
[[is:Storkuhamur]]
[[it:Solido]]
[[he:מוצק]]
[[kn:ಘನ]]
[[lv:Cieta viela]]
[[jbo:sligu]]
[[hu:Szilárd halmazállapot]]
[[mk:Цврста агрегатна состојба]]
[[ms:Pepejal]]
[[nl:Vaste stof]]
[[ja:固体]]
[[no:Faststoff]]
[[nn:Fast stoff]]
[[nov:Solide]]
[[om:Solid]]
[[pl:Ciało stałe]]
[[pt:Sólido]]
[[ro:Solid]]
[[qu:Sinchiyasqa]]
[[ru:Твёрдое тело]]
[[simple:Solid]]
[[sk:Pevná látka]]
[[sl:Trdnina]]
[[fi:Kiinteä olomuoto]]
[[sv:Fast form]]
[[th:ของแข็ง]]
[[vi:Chất rắn]]
[[tr:Katı]]
[[uk:Тверде тіло]]
[[zh:固体]]'''''

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