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

The standard temperature and pressure values for sea level are established by the International Standard Atmosphere (ISA) model, which serves as a reference for various aviation and meteorological calculations. According to this model, the standard temperature at sea level is defined as 15 degrees Celsius (C), and the standard atmospheric pressure is set at 29.92 inches of mercury (Hg).

The choice that states 15 degrees C and 29.96" Hg does not match the recognized standard of 29.92" Hg. While 29.96" Hg is quite close, it is not the established standard value, which leads to inaccuracies in calculations and scenarios that rely on precise definitions for flight and atmospheric analysis.

Thus, the correct answer identifies the standard values that align with the ISA: a temperature of 15 degrees Celsius and a pressure of 29.92 inches of mercury. Understanding these standard values is crucial for those involved in aviation, meteorology, and other fields that rely on atmospheric conditions.