What factor would likely increase density altitude?

An increase in ambient temperature would likely increase density altitude because it directly affects the air density. As temperature rises, the air becomes less dense, meaning that the same volume of air has fewer molecules in it. This can be understood through the ideal gas law, which states that at constant pressure, an increase in temperature will result in a decrease in density. Density altitude is effectively the height at which the air density is equal to a standard atmosphere, so when the ambient temperature is higher, the density altitude rises.

In terms of flying, a higher density altitude can impact aircraft performance, making it crucial for operators to understand the relationship between temperature and density altitude, especially in the context of takeoff distance, climb rate, and overall aircraft performance.