What is the atmospheric pressure of air at sea level in psia?

The atmospheric pressure of air at sea level is commonly accepted to be approximately 14.7 pounds per square inch absolute (psia). This value represents the weight of the air above a given point and is an important standard in various scientific and engineering applications, particularly in fields like gas measurement and fluid dynamics.

The significance of 14.7 psia comes from its role in defining standard atmospheric conditions, which serve as a baseline for calculations involving gas laws and other related concepts. Understanding atmospheric pressure at sea level is crucial for professionals working with gas systems, as it helps in determining how gases behave under different conditions.

The other options provided do not reflect the widely accepted value of atmospheric pressure at sea level, making them incorrect in this context. Therefore, 14.7 psia stands out as the accurate answer for atmospheric pressure at sea level.