How is "density altitude" defined?

Density altitude is defined as pressure altitude corrected for non-standard temperature. This concept is crucial for pilots because it relates to how the aircraft performs in various atmospheric conditions.

When the air temperature is higher than the standard temperature (which is defined as 15 degrees Celsius at sea level), the air density decreases. Consequently, this reduced density affects lift, engine performance, and propeller efficiency, all of which are critical for safe aircraft operation. By correcting the pressure altitude for temperature, pilots obtain the density altitude, which provides a more accurate representation of the aircraft’s performance capabilities in the existing conditions.

Understanding density altitude enables pilots to make informed decisions regarding takeoff distances, climb rates, and overall performance limits in relation to the aircraft's operation in both high-density and low-density environments.