As density altitude increases, how does air density change?

As density altitude increases, air density decreases. This relationship is due to the fact that density altitude is a measure of the air's density relative to standard atmospheric conditions, primarily influenced by temperature, pressure, and humidity. At higher density altitudes, the atmosphere becomes thinner, meaning fewer air molecules are present in a given volume of air.

This decrease in air density has significant implications for aircraft performance. As air density diminishes, engines may produce less thrust, wings generate less lift, and propellers become less efficient, all of which can impact an aircraft's ability to take off, climb, and maneuver effectively. Therefore, it’s important for pilots and air traffic controllers to understand how changes in density altitude can affect flight operations.