This lecture covers the dynamics of perfect fluids, focusing on incompressible flow and irrotational flow. It explains the concept of incompressible fluids, conservation of mass, and the simplifying conditions for flow fields. The lecture also delves into the characteristics of perfect fluids, including negligible viscosity and reversible adiabatic processes. The Bernoulli equation and the forces acting on a piece of fluid in a constant gravity field are discussed, emphasizing the idealized nature of perfect fluids.