Pressure is defined as the force applied per unit area on the surface of an object. It is a fundamental concept in physics that plays a crucial role in various fields, including engineering and meteorology. For example, atmospheric pressure is the weight of air above us, influencing weather patterns and flight dynamics. In fluids, pressure can change with depth, as seen in liquids like water. The deeper you go, the greater the pressure due to the weight of the fluid above. This principle is essential in understanding phenomena such as buoyancy and hydraulics, which are vital in designing submarines and hydraulic systems.