Bar, PSI and atmospheres are the most commonly used pressure units across most industries. One bar is equal to 14.5 PSI and approximately 0.99 atmospheres.
Pressure is a measure of force over an area. In the case of PSI, it can be measured by recording the amount of pound-force being applied to a certain surface area in square inches. The most common use for pressure measurements in PSI is in material science to determine the tensile strength of different materials.Learn more about Physics