What describes 'hot and humid' air?

Hot and humid air is characterized as unstable air due to its buoyant properties. When air becomes warmer, it can rise more easily because it is less dense than the cooler air surrounding it. Humidity adds to this instability; when moist air is heated, it can hold even more moisture and rise, leading to the development of clouds and possibly even storms. This rising behavior leads to turbulent conditions, which is indicative of instability in the atmosphere.

In contrast, stable air resists upward motion, tends to remain layered, and is more likely to produce clear skies. High altitude air is not specifically defined by temperature and humidity, and dry air lacks the moisture that contributes to instability. Therefore, 'hot and humid' air is best described as unstable air because of its tendency to rise and create convection currents.