What is a psi?

PSI stands for pounds per square inch, which is a unit of pressure commonly used in various applications such as measuring tire pressure, water pressure, and air pressure. It is a measurement of the force exerted by one pound of mass acting on an area of one square inch. PSI is often used in engineering, physics, and other scientific fields to quantify the amount of pressure exerted by a fluid or gas on a surface. In the context of tire pressure, for example, the recommended PSI for a car's tires can affect the vehicle's handling, fuel efficiency, and overall performance. Keeping tires properly inflated to the correct PSI level is important for safe driving and maintaining the longevity of the tires.