Question

why hot air is less densor than that of cold air​

Answer 1

Cold air is denser than warm air. because the molecules are packed closer together. The amount of water vapor in the air also affects the density of the air. The more water vapor that is in the air, the less dense the air becomes.

The more air molecules in once space, the denser the air. As air gets warmer, the air molecules have more energy. All these hot, energized molecules will move around everywhere, increasing the speed of the air, losing density

Answer 2

Explanation:

this is because as we heat air the molecules also expand so they are less denser than cold air