What does hydraulics primarily deal with?

Hydraulics primarily deals with the physical behavior of liquids, particularly how liquids behave under pressure. This field of study focuses on the principles of fluid dynamics and fluid mechanics, which encompass the movement of liquids in various applications, such as in hydraulic systems, water supply systems, and various engineering projects like dams and pipelines.

Understanding the physical behavior of liquids involves analyzing how fluids interact with forces, how they flow, and how they exert pressure. This knowledge is critical in designing systems that utilize liquid movement, such as hydraulic brakes in vehicles or hydraulic lifts in construction.

In contrast, the other options refer to different areas of study. For instance, the movement of gases is the focus of a different discipline known as pneumatics. The flow of electricity pertains to electrical engineering, while the mechanics of solids involve the study of solid materials under various forces and stress. Each of these areas is distinct from hydraulics, which is specifically characterized by its focus on liquids and their dynamics.