Which condition would cause the altimeter to indicate a lower altitude than true altitude? A stable layer of air. water vapor condenses. air temperature. CORRECT: Air temperature warmer than standard What feature is associated with a temperature inversion? air temperature. Actual lapse rate. At standard temperature. CORRECT: A stable layer of air. Which factor would tend to increase the density altitude at a given airport? At standard temperature. air temperature. CORRECT: An increase in ambient temperature. In colder than standard air temperature. Under which condition will pressure altitude be equal to true altitude? At standard temperature. CORRECT: When standard atmospheric conditions exist. A stable layer of air. water vapor condenses. What are characteristics of unstable air? produce stratus type clouds. Warming from below Actual lapse rate. CORRECT: Turbulence and good surface visibility. If an unstable air mass is forced upward, what type clouds can be expected? In colder than standard air temperature. CORRECT: Clouds with considerable vertical development and associated turbulence. friction between the wind and the surface. lower than the actual altitude above sea level. Every physical process of weather is accompanied by, or is the result of, a CORRECT: heat exchange. Actual lapse rate. air temperature. 6,000 feet MSL.