What is the atmospheric pressure at sea level measured in millibars?

The atmospheric pressure at sea level is commonly accepted to be around 1,013.25 millibars, which is often rounded to 1,013.52 millibars in various scientific and practical applications. This value represents the average standard atmospheric pressure at sea level and is crucial for divers and those involved in atmospheric studies, as it serves as a baseline for calculations involving changes in pressure due to depth or altitude.

Understanding this value is essential in diving safety since pressure changes affect the behavior of gases in the body, which can influence dive planning, ascent rates, and the risk of decompression sickness. The standard atmospheric pressure is a critical reference point from which divers can measure the additional pressure encountered underwater, which increases approximately 1 atmosphere or 1013.25 mb for every 10 meters of depth in seawater. Thus, grasping the significance of 1,013.52 millibars sets the foundation for safe diving procedures and the management of pressure-related physiological effects.