Private Pilot Private Exam

What is a notable feature of a temperature inversion?

1. An unstable layer of air

2. A stable layer of air

3. A turbulent layer of air

4. A mixed layer of air

The correct answer is: A stable layer of air

A temperature inversion is characterized by a stable layer of air. During a temperature inversion, the typical decrease in air temperature with increasing altitude is reversed, leading to warmer air above cooler air. This phenomenon creates a stable atmospheric condition where the cooler air is trapped below the warmer layer, preventing it from rising and mixing with the air above. This stability inhibits vertical air movement, which can lead to the accumulation of pollutants and fog. The warm air acts as a cap, effectively isolating the cooler air below it. Because of this stability, weather conditions tend to remain calm, and the development of turbulence is limited. This understanding is crucial for pilots, as temperature inversions can significantly affect visibility and flying conditions.