**Fluid mechanics** is a branch of

continuum mechanics that relies on the approximation of molecular fluids claimed in the [continuum postulate]

? (not to be confused with the

continuum hypothesis) to describe the deformation of gases and liquids. Alternate derivation via

statistical mechanics justifies, for example, the use of fluid dynamic models and terminology in

traffic engineering.

**See also:**
Navier Stokes Equations

[Compressible flow]?, [Incompressible flow]?, [Newtonian fluid]?, [Non-Newtonian fluid]?, Laminar flow, Turbulence?, Rheology

[Surface tension]?, [Vapor pressure]?

Acoustic theory largely derives from fluid mechanics.