What is the SI unit of pressure?

The SI unit of pressure is the Pascal, which is defined as one newton per square meter (N/m²). This unit is named after Blaise Pascal, a French mathematician and physicist who made significant contributions to the study of fluid mechanics and pressure. In the International System of Units (SI), Pascal is the standard measurement employed to quantify pressure and is widely used in various scientific and engineering applications.

Other units like bar, atmospheres, and millimeters of mercury, while used in specific contexts, are not part of the SI system. The bar, for instance, is commonly used in meteorology, whereas atmospheres and millimeters of mercury are often encountered in chemistry and physics. However, to maintain consistency and standardization in scientific measurements, the Pascal is recognized as the definitive unit of pressure in the SI system.