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

The standard atmospheric pressure at sea level is typically measured in inches of mercury (inHg), which is a traditional unit of measurement for pressure in meteorology and aviation contexts. This measurement reflects the height of a column of mercury that is supported by the atmospheric pressure at sea level. The standard atmospheric pressure at sea level is defined as 29.92 inches of mercury.

In addition to inches of mercury, atmospheric pressure can also be expressed in other units, such as Pascals, atmospheres, and millimeters of water, but inches of mercury remains an important and widely used unit due to historical practices in weather reporting and related fields. The other units, while valid, are less common in certain contexts compared to the use of inches of mercury to describe standard atmospheric pressure.