This document discusses different types of fluids and flow patterns. It defines fluids as anything that can flow and has no definite shape. There are two main types of fluids - liquids and gases. Flow is defined as the quantity of fluid passing a point over time. Viscosity measures a fluid's resistance to flow and depends on factors like temperature. Common flow patterns include steady or unsteady, turbulent, compressible or incompressible, viscous or non-viscous, and streamline. Agitated vessels use impellers and baffles to induce specific flow patterns important for processes like mixing and homogenization.