The textbook discusses the main properties and physical principles on which the applied part of fluid and gas mechanics is based. Strictly and consistently set out key ideas about the task of motion of a continuous medium and about the voltage at the point of the medium. Strictly stated is the conclusion of the differential equation of motion of a continuous medium in voltages. Its application is shown: for derivation of equations describing equilibrium in liquid and gas; for derivation of basic equations of motion of ideal liquid. The solution of these equations is given, the energy and geometric meaning of Bernoulli's equations is described . The training manual is intended for students of the direction of training 13. 03. 01 (140100.) 62) "Heat power engineering and heat engineering", and can also be useful for directions 15. 03. 02 (151000. 62) "Technological Machines and Equipment" and 20. 03. 01 (280700.) 62) "Technosphere Security" .