ABSTRACT
The term fluid is used for materials that are in a state in which they can flow and have no particular shape of their own but assume the shape of the containing vessel. Thus the term fluid can encompass both liquids and gases. Gases, however, can be compressed and show significant volume changes whereas liquids do not show noticeable changes in volume when subject to pressure and can generally be regarded as incompressible. This chapter is about the basic properties of incompressible fluids, i.e. liquids, and includes a consideration of the pressure due to depth of immersion in a fluid, the thrust exerted on surfaces immersed in them and the energy changes involved in the flow of such fluids.
