What is atmospheric pressure measured at sea level?

Atmospheric pressure at sea level is typically defined as 760 mm Hg, which corresponds to the weight of the air pressing down at that elevation. This standard measurement, known as one atmosphere (1 atm), is rooted in historical barometric pressure readings when mercury barometers were commonly used to gauge atmospheric pressure.

The significance of the value 760 mm Hg is due to its correlation with the standard atmospheric conditions that were established in the 19th century. This value is essential in various scientific fields, including meteorology and physical sciences, as it serves as a baseline for calibrating equipment and conducting experiments.

It's important to understand that atmospheric pressure can vary based on altitude and weather conditions, but at sea level, the accepted and widely used measurement remains 760 mm Hg. This value helps in numerous calculations and comparisons in both natural and applied sciences, contributing to our understanding of atmospheric behavior and phenomena.