https://www.boldmethod.com/learn-to-fly/performance/density-altitude-what-it-is-performance

Density altitude is a measure of how ‘thick’ the air is, and it’s based on three factors: atmospheric pressure, temperature, and humidity.

The technical definition of density altitude is « pressure altitude, adjusted for non-standard temperature. » What that really means is on hot days, the air is much ‘thinner’, or less dense, than it is on cold days.

Why does that matter? It’s a big factor in your airplane’s performance, because when the air surrounding your plane is less dense, it means your wings, propeller, and engine will have a lot less performance, and it will take you more time to get airborne during takeoff.

Traduction en FR de Google