The SI system is built around seven base units , and from these, many derived units are formed to measure complex quantities such as force, pressure , and energy. We will look at what is the unit of pressure by first learning about the SI system, which is the International System of Units , derived from the metric system. The SI unit also elaborately known as the International System of Units has been mainly adopted from French Système international (d’unités). This is a modern version of the metric system and is popularly used when measuring physical quantities. This system is built upon seven base units which are, Metre, Kilogram, Ampere, Kelvin ... Learn the unit of pressure in physics: SI unit , symbols, formulas, and conversions with exam-focused examples. Master pressure units for success. The SI unit of pressure is the pascal (Pa), equal to one newton per square meter (N·m−2 or kg·m−1·s−2). This name for the pressure unit in..