Air pressure at sea level equals ____________ inches of mercury?

Air pressure at sea level is commonly referenced as 29.92 inches of mercury (inHg). This measurement is used as a standard reference for atmospheric pressure in various fields, including meteorology and fluid dynamics. The value corresponds to the height of a mercury column that is supported by the atmospheric pressure exerted at sea level.

The significance of 29.92 inches of mercury lies in its use in pressure measurements, where it is often used for calibrating barometers and understanding buoyancy in fluids in fluid power applications. This standard value allows for consistent communication and calculations involving pressure systems.

The other values presented do not correspond to the widely accepted standard for sea level air pressure, demonstrating that understanding atmospheric pressure and its measurement is crucial in practical applications related to fluid power systems.