HELLO EXPERT 567 ## In mechanical engineering, theoretical bases serve as foundations for understanding and developing various systems and processes. These theories encompass principles of mechanics, thermodynamics, fluid dynamics, materials science, and control systems. They provide frameworks for analyzing and predicting the behavior of mechanical systems, aiding in design, optimization, and troubleshooting. By delving into theoretical frameworks, engineers can devise innovative solutions, improve efficiency, and ensure the reliability and safety of mechanical components and systems.