* Random Motion: Atmospheric molecules are constantly in random motion. This means their individual velocities are constantly changing, and their directions are unpredictable.
* Average Velocity: While individual molecules have velocity, the average velocity of all the molecules in a large sample is typically zero. This is because the molecules are moving in all directions with equal probability, effectively canceling each other out.
* Wind: The situation where the average velocity of atmospheric molecules is not zero is simply called wind. Wind is the movement of air, caused by differences in air pressure.
In summary: It's not unusual for the average velocity of atmospheric molecules to be non-zero, and this is simply the condition known as wind.
