What factors determine density altitude?

Density altitude is a critical concept in aviation as it affects aircraft performance. It is primarily determined by temperature and atmospheric pressure. As air temperature increases, air density decreases, leading to a higher density altitude. Similarly, lower atmospheric pressure, which typically occurs at higher altitudes or during warmer conditions, also results in decreased air density.

Thus, when both higher temperatures and lower pressure are present, the density altitude will be significantly elevated. This is essential for pilots and mechanics to consider, especially when calculating aircraft performance metrics such as takeoff distance, climb rate, and stall speed.

While some of the other factors mentioned in the alternatives may influence aviation operations, they do not directly determine density altitude. For instance, humidity affects air density but is not one of the primary factors outlined in determining density altitude. Wind speed, on the other hand, doesn't play a role in establishing density altitude as it does not influence air density directly.