What is density altitude?

Density altitude is a measure of the density of air relative to a standard atmosphere, taking into account temperature and pressure conditions. It is important in aviation because it affects aircraft performance, such as lift and thrust. When the altitude increases or when the temperature rises, air density decreases, leading to a higher density altitude. Understanding density altitude helps pilots make informed decisions regarding aircraft performance, especially in takeoff, landing, and climbing.

The other options do not accurately capture the definition of density altitude. The first option addresses pilot perception of turbulence rather than the physical properties of air. The third option refers to standard altitude, which does not specifically relate to air density. The fourth option discusses weather patterns, which are not directly related to the concept of density altitude.