This document provides an introduction to fluid mechanics for chemical engineers. It defines a fluid and discusses the continuum hypothesis. It describes key fluid properties like density, pressure, viscosity, surface tension and vapor pressure. It also classifies fluid motions as steady or unsteady, uniform or non-uniform, viscous or inviscid, compressible or incompressible, and laminar or turbulent. The document provides examples of areas where fluid mechanics is applied, like process units, pipelines, fluid machinery and environmental applications.