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

The standard temperature and pressure values for sea level are established as a baseline for various purposes in meteorology and aviation. The correct choice indicates that the standard temperature at sea level is 15 degrees Celsius, and the standard atmospheric pressure is 29.92 inches of mercury (Hg).

These values are internationally recognized and are used in calculations involving aircraft performance, including density altitude and performance metrics. The temperature of 15 degrees Celsius is important because it represents a typical mid-latitude average that can be used in atmospheric models. Similarly, 29.92 inches of mercury is equivalent to 1013.25 millibars of pressure, highlighting that this value is consistent with standard atmospheric conditions.

Other choices present different temperatures and pressures, which do not align with the internationally accepted standard. For example, the temperatures and pressures given in those options would lead to inconsistent atmospheric models and calculations regarding aircraft performance.