What is the SI unit for atmospheric pressure at sea level?

The SI unit for atmospheric pressure at sea level is commonly represented as 101.3 kPa. This value is derived from the definition of standard atmospheric pressure, which defines sea level pressure as being equal to 101.325 kPa, but it is often rounded to 101.3 kPa for simplicity in calculations and discussions.

To clarify, kilopascals (kPa) are part of the International System of Units (SI), which is the modern form of the metric system. The use of kPa makes it a standardized measurement for pressure in scientific and engineering contexts.

Other options may represent atmospheric pressure as well, but they do not align directly with the SI unit convention or are not as commonly used. Atmospheric pressure expressed in atmospheres (1.01 atm), hectopascals (1020 hPa, which is equivalent to 102 kPa), or bars (1 bar) might be relevant in specific contexts, yet they do not provide the precision typically referenced in terms of SI units for standard atmospheric conditions. In summary, 101.3 kPa serves as the most accepted and accurate SI representation of atmospheric pressure at sea level.