What is the unit of pressure in the SI system?

The correct unit of pressure in the SI (International System of Units) system is the Pascal. One Pascal is defined as one newton per square meter, which directly relates force to area—critical for understanding how pressure is applied in various engineering contexts.

The Pascal is widely used in scientific and engineering calculations because it provides a clear, standardized measure of pressure, making it easier to communicate and compare measurements across different disciplines and applications. The other units mentioned, such as pound per square inch or atmosphere, are either part of non-SI systems or commonly used in specific contexts, but they do not represent the standard unit defined by the SI system. Using the Pascal ensures consistency and precision in pressure measurement, essential for accurate engineering designs and safety assessments.