solid

A dense form of matter characterized by its ability to transmit twisting forces and its inability to flow; virtually incompressible; tends to retain shape when stressed; described as rigid, the atoms generally not being free to move from point to point. Solids are divided into crystals, comprising ordered arrays of atoms; amorphous solids, which are disordered arrays; and polymers and rubbers, which comprise long chain-like molecules.

Continuum mechanics

General

Classical mechanics Stress Tensor Conservation of mass Conservation of momentum

Solid mechanics

Solids Elasticity Plasticity Hooke's law Rheology

Fluid mechanics

Fluids Fluid statics Fluid dynamics Navier-Stokes equations Viscosity Newtonian fluids Non-Newtonian fluids

A solid object is in the phase of matter characterized by resistance to deformation and changes of volume.

At the microscopic scale, a solid has these properties:

The atoms or molecules that comprise the solid are packed close together.

The branch of physics that deals with solids is called solid-state physics, and is a type of condensed matter physics.

The lightest known solid is man-made and is called aerogel.