What unit is used to measure pressure in the metric system?

The Pascal is the standard unit of pressure in the metric system. It is defined as one newton per square meter (N/m²), making it a coherent unit derived from basic SI (International System of Units) units. This definition links pressure directly to force and area, which are fundamental concepts in physics.

Using the Pascal provides a clear and consistent way to quantify pressure, essential in various fields such as engineering, meteorology, and physics. While the bar is also a common unit for pressure, it is not part of the SI system; rather, it is a metric unit that is used in some contexts and is equivalent to 100,000 Pascals. Psi (pounds per square inch) is a non-metric unit commonly used in the United States, while the newton measures force rather than pressure. Pressure requires both a force and area represented together, which is why the Pascal is universally recognized in the metric system.