In fluid dynamics, dynamic pressure (denoted by  or  and sometimes called velocity pressure) is the quantity defined by:
where (in SI units):
* is the dynamic pressure in pascals (i.e., kg/(m*s),
* (Greek letter rho) is the fluid mass density (e.g. in kg/m), and
* is the flow speed in m/s.
It can be thought of as the fluid's kinetic energy per unit volume.
For incompressible flow, the dynamic pressure of a fluid is the difference between its total pressure and static pressure. From Bernoulli's law, dynamic pressure is given by
where  and  are the total and static pressures, respectively.