1. True or False: Water vapor is only visible on really cold days where the air temperature is below freezing.

The correct answer is - False.

Explanation:

Water vapor is water in its gaseous state. Water vapor is totally invisible, an individual can not see water vapor in any situation with naked eyes. Fog, clouds, mist are not the water vapor as they contain liquid water or droplets.

Water vapor is essential for the weather and climate, without water vapor there would be no rain, snow or clouds as require water vapor to form.

Thus, the correct answer is - false.