This course is an understanding of the concept of the First Law of Thermodynamics regarding the conservation of energy and the concept of control mass and control volume systems. The discussion begins with an introduction to SI and British unit conversions, the concept of work and energy in thermodynamics, and energy balance in closed systems. Then the discussion is deepened for control mass systems with an introduction to thermodynamic properties related to control mass systems, namely pressure, temperature, specific volume and specific internal energy. The discussion of control mass systems is further deepened with the introduction of the ideal gas model for fluids in the gas phase. The next discussion is evaluating control volume systems such as nozzles, diffusers, turbines, compressors, pumps and introducing fluid properties related to control volume systems, namely enthalpy.