What is the SI unit of pressure?

The SI unit of pressure is the Pascal, which is defined as one newton per square meter. Pressure is a measure of force applied over a certain area, and the Pascal provides a standardized measurement within the International System of Units (SI).

In practical terms, this means that when one newton of force is exerted uniformly over an area of one square meter, the pressure is defined as one Pascal. The use of Pascals as the unit allows for clarity and precision in scientific and engineering contexts, making it easier to communicate and calculate various physical phenomena related to pressure.

Other options, while they may also be used to describe pressure in different systems or contexts, are not the SI units. Newtons measure force rather than pressure, atmospheres are often used in meteorology and aviation but are not part of the SI system, and bars are another unit of pressure but are not defined as SI units either. Thus, Pascals remain the standard unit for measuring pressure within scientific discourse.