What is the unit of measurement for atmospheric pressure?

There are several standard units of atmospheric pressure and can be converted between them depending on the units used for force and area such as grams, kilograms, meters, and kilometers

1. - Pascal (Pa): It is the recognized and approved unit in the International System of Units for measuring atmospheric pressure, and because it is considered very small, it is converted into kilopascals (kPa).
2. Atmospheric pressure (atm): i.e. (atmosphere), also used to measure atmospheric pressure, equal to 101.3 kPa.
3. - Millimeters of mercury (mmHg): Atmospheric pressure is measured by determining the height of the mercury column in the barometer, and it can be converted into a unit (atm), as 1 atm equals 760 mmHg.
4. Pounds per square inch (psi): 1 atm equals 14.7 psi.