Fluid mechanics is a field of physics that analyzes the forces exerted by and the behavior of fluids, which include both liquids and gases. The study is generally divided into fluid statics, which deals with fluids at rest, and fluid dynamics, which examines fluids in motion. Key principles governing fluid behavior include the continuity equation, which relates mass conservation, and the momentum equation, which describes the forces acting on a moving fluid element. Applications of this field are broad, encompassing areas such as aerodynamics, which studies airflow over surfaces, and hydraulics, which analyzes the flow of water. The principles are crucial for designing systems ranging from aircraft wings and pipelines to oceanographic monitoring equipment.