2. The experimental and mathematical-computational study of the mechanical behavior of fluids.

Fluid mechanics includes the transfer of heat and matter resulting from motion of the fluid, and the driving of the fluid motion due to differences in density which may be induced by temperature, as well as the effects due to temperature dependency of the constants of materials; for example, the viscosity.

3. The study of fluids and gases at rest and in motion which can be divided into*hydrostatics*, the behavior of liquids at rest;

*hydrodynamics*, the behavior of liquids in motion; and

*aerodynamics*, the behavior of gases in motion.

**Hydrostatics** takes into account the forces exerted by a liquid in all directions, not just the downward gravitational pull; such as, the upward force exerted on a submerged object that causes bouyancy.

**Hydrodynamics** is the study of fluid flow and fluid friction, or viscosity.

**Aerodynamics** is the study of the motion of gases which is most often applied to the study of air and the motion of solid bodies in it.

This includes hydrostatics, or the study of fluids at rest, and hydrodynamics or fluid dynamics, the study of fluids in motion.