What happens to air density as temperature increases at altitude?

As altitude increases, air density is inversely related to temperature. When the temperature increases, the air molecules become more energetic and move further apart from each other. This increased molecular motion leads to a decrease in the density of the air, meaning that warm air is less dense than cooler air.

At higher altitudes, temperatures often decrease; however, if we consider a scenario where the temperature increases at a constant altitude, the air density would still decrease due to the reasons mentioned. In summary, as temperature increases at altitude, the overall effect is a reduction in air density. This principle is fundamental in understanding atmospheric behavior and is essential for various applications in aviation and meteorology.