How is pressure defined in psi (pounds per square inch)?

Pressure is defined as the amount of force applied to a specific area. In the case of psi (pounds per square inch), it quantifies how much weight or force is exerted over one square inch of surface area. The formula for pressure is derived from the relationship between force and the area over which that force acts.

The correct formula for pressure is the ratio of force to area, which means that for a given force, as the area increases, the pressure decreases, and vice versa. This relationship is fundamental in various applications, especially in aviation maintenance where pressure readings are critical for understanding fluid dynamics, component tolerances, and safety measures.

Thus, when calculating psi, it is essential to remember that pressure increases with greater force and decreases when that force is spread over a larger area. This foundational understanding is crucial for mechanics and engineers in fields such as aviation and beyond.