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

The standard temperature and pressure values for sea level are defined as 15°C (59°F) and 29.92 inches of mercury (Hg). These values are established by international standards and are commonly used in aviation and meteorology as a baseline for aircraft performance calculations and atmospheric pressure readings.

Understanding these standard conditions is crucial for various aspects of flight planning, aircraft performance analysis, and the calculation of density altitude. At these standard conditions, the atmosphere is considered to be at its baseline state, which provides a reference for pilots and engineers when evaluating how an aircraft will perform under different weather conditions.

The other options present temperatures and pressures that deviate from these standard values, which makes them less applicable for the foundational understanding of atmospheric conditions at sea level.