What are the "standard temperature" and "standard lapse rate" values at sea level?

• A. 10°C and 3°C per 1,000 feet
• B. 0°C and 4°C per 1,000 feet
• C. 15°C and 2°C per 1,000 feet
• D. 20°C and 1.5°C per 1,000 feet

Answer: (C)

The standard temperature at sea level is defined as 15°C, which is a key value used in aviation and meteorology for calculations regarding atmospheric conditions. The standard lapse rate refers to the rate at which temperature decreases with an increase in altitude in the troposphere, which is 2°C for every 1,000 feet. These values are utilized in various calculations, such as determining aircraft performance, weather predictions, and altitude adjustments.

In this context, the correct answer highlights the standard reference points that serve as a baseline for understanding how temperature behaves in the atmosphere as altitude changes. The values play a critical role in ensuring pilots and meteorologists can make precise assessments.