What happens to air density as temperature increases?

As temperature increases, air density decreases due to the principles of thermodynamics and gas behavior. When air is heated, the molecules move more rapidly and typically spread out, occupying a larger volume. This expansion of air leads to a reduction in density, since density is defined as mass per unit volume. In simpler terms, when the temperature goes up, the same amount of air occupies a greater space, resulting in lower density.

Understanding this relationship is crucial, especially in aviation, as changes in air density can affect aircraft performance, engine efficiency, and lift generation. This concept underlies many calculations involving altitude and temperature variations encountered during flight, making it an essential aspect of aircraft operations and aerodynamics.