Fluids is the study of the mechanical properties of liquids and gases - how they flow, how they behave under pressure, the buoyant force associated with them and how we use these properties in everyday life.  We'll start with some basics on density and pressure, then take a look at how pressure differences for objects in a fluid can create a buoyant force.  We'll finish with a quick look at hydraulics and characteristics of pressure and velocity for fluids that are moving.