The standard unit of pressure in physics is the pascal (Pa). Defined as one newton per square meter, it quantifies the amount of force applied over a unit area. Named after the French mathematician and physicist Blaise Pascal, the pascal is widely used in various scientific fields, including physics, engineering, and meteorology. For practical purposes, other units such as atmospheres (atm), millimeters of mercury (mmHg), and pounds per square inch (psi) are also commonly used; however, the pascal remains the official SI unit of pressure. In everyday contexts, expressing pressure in bar (100,000 pascals) is also quite common.