What is considered standard atmospheric pressure at sea level?

Standard atmospheric pressure at sea level is defined as 14.7 psi (pounds per square inch). This value is established by various scientific measurements and is a fundamental reference point in multiple fields, including aviation and meteorology.

Understanding this standard is crucial for A&P mechanics because it serves as a baseline for various calculations, including fuel systems, engine performance, and altimeter settings. Atmospheric pressure affects engine performance, fuel efficiency, and aerodynamic properties, making awareness of this value essential for accurate measurements and safe aircraft operation.

When working with aircraft systems, mechanics often need to reference this standard when assessing pressure-related issues, ensuring that all gauges and systems reflect accurate atmospheric conditions. Hence, the recognition of 14.7 psi as the standard atmospheric pressure at sea level is vital for maintaining operational integrity within aviation practices.