What are the standard temperature and pressure values for sea level?

The standard temperature and pressure values for sea level are recognized as 15°C (which is equivalent to 59°F) and 29.92 inches of mercury (Hg). This specific combination is a widely accepted reference point in aviation and meteorology, often referred to as the International Standard Atmosphere (ISA).

Understanding these standard conditions is critical for pilots, as they serve as a baseline for various calculations related to aircraft performance, including lift, engine performance, and fuel efficiency. The units used for pressure can vary, and while millibars are also a common unit for atmospheric pressure (with 29.92 inches of Hg being approximately equal to 1013.2 millibars), the correct answer utilizes the standardized measurement of inches of mercury, which is often more familiar to aviators in the United States.

Thus, option A correctly identifies both the temperature and pressure, aligning with the established standard atmosphere conditions used in aviation.