What is the standard atmospheric pressure at sea level?

The standard atmospheric pressure at sea level is represented in various units, and all the provided choices convey this same pressure value in different formats.

14.7 pounds per square inch (psi) is a common measurement used in engineering and certain scientific applications, providing an understanding of atmospheric pressure in a unit that is familiar to many.

29.92 inches of mercury (inHg) originates from the barometric measurement system. Historically, this unit has been used extensively in meteorology for reporting atmospheric pressure due to its utility in calibrating barometers.

1013.25 millibars is a metric unit of pressure. Millibars are widely used in meteorology across the globe, making it easier to standardize and communicate weather-related information.

Since all these different units accurately reflect the same atmospheric pressure at sea level, the correct answer conveys that they are equivalently valid measurements of the standard atmospheric pressure.