A pascal (Pa) is a unit of pressure in the International System of Units (SI). It is defined as one newton of force applied over an area of one square meter. This means that if you push down with a force of one newton on a surface that is one square meter in size, you create a pressure of one pascal. Pascals are commonly used in various fields, including physics, engineering, and meteorology. For example, atmospheric pressure at sea level is about 101,325 pascals, which is often rounded to 101.3 kilopascals (kPa) for convenience.