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The hot air has molecules that are continuously and rapidly moving. Due to the fast movement of the molecules, they are away from each other, leading to low density. On the other hand, the cold air has comparatively closer molecules, due to which they are denser and weigh more than the same amount of hot air.

Heat is the energy measured in terms of temperature in the environment. High heat increases the temperature and makes the air warm. High temperatures can often lead to humidity.

Humidity is the measure of water vapor present in the air. Hot air absorbs more water vapor and thus increases humidity. In simpler terms, humidity is the capturing of water as gas by the air.

Heat and humidity are different terms and denote different meanings. When the temperature is high, the air readily absorbs water vapor because of the fast movement of air molecules. High humidity in the air makes the weather more problematic, and thus the idiom 鈥淚t鈥檚 not the heat; it鈥檚 the humidity鈥� is said.

Dry heat occurswhen there is no water in any form in the air. This is more favorable as high humidity makes the population uncomfortable and also enhances the growth of many pathogenic organisms.