FAA Ground School Practice Test

What is a characteristic of stable air?

1. Stratiform clouds

2. Cumuliform clouds

3. Rising air

4. Turbulent conditions

The correct answer is: Stratiform clouds

A characteristic of stable air is the presence of stratiform clouds. Stable air is typically associated with a lack of vertical movement and is characterized by a smoother atmosphere. In such conditions, the air does not rise significantly, which leads to the formation of stratiform clouds. These clouds are layered and spread out rather than towering or fluffy, indicating that the air remains relatively undisturbed. In contrast, unstable air is usually marked by rising air and the development of cumulus clouds, which are cumuliform in nature and often indicate convective activity. Turbulent conditions are also more prevalent in unstable atmospheres, where vertical movements are pronounced. Therefore, the presence of stratiform clouds serves as a clear indicator of stable atmospheric conditions.