Which measurement unit is used for atmospheric pressure?

The appropriate measurement unit for atmospheric pressure is Pascals (Pa), which is part of the International System of Units. This unit quantifies pressure as a force (in newtons) applied over an area (in square meters). Atmospheric pressure at sea level is typically measured to be about 101,325 Pa, which is equivalent to 1 atmosphere (atm).

Pounds per square inch (psi) is another unit used to measure pressure, especially in the context of tires and other applications in the United States. While it can be utilized to express atmospheric pressure, it is not the standard SI unit for this purpose, and therefore, it does not represent the most accurate or widely accepted choice for atmospheric pressure.

Grams per liter (g/L) measures density or concentration but does not relate to pressure. Similarly, Kelvins (K) is a unit of temperature and does not pertain to pressure measurements at all.

In summary, while psi can describe atmospheric pressure in certain contexts, the correct and standard measurement unit for atmospheric pressure is Pascals (Pa).